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Discussion Starter #1 (Edited)
SOLVED: A5 2010 2.0 TFSI Chasing down an EPC Light

Hi and welcome to my thread.

I apologise now for the length of the post (but i hope it shows ive been using pointers off here before just asking for help). If you make it to the end.... you might be the hero I'm looking for!

Ive been reading this site for a while now and taken some guidance, but after a series of attempts to resolve my issue... I'm stumped.

Recently purchased my 2010 A5 2.0 TFSI 100K Miles - Has a warranty from my car seller extended to 15 months. (14/13 months left)

Before purchase

The car had a check engine light on. (turned out to be P0341 Camshaft Position Sensor - Circuit Range/Performance Bank1/Single Sensor) Car seller agreed to have the car fixed and it was sent to independant Audi specialist to have the work carried out.

Seller advised that Independant replaced the camshaft position sensor, which did not correct the fault and then replaced the manifold, which appeared to have corrected the fault. MOT completed and car returned to sellers dealership.

Check engine light returned onway back to sellers dealership. Seller advised me and I agreed with dealer that I would run the car over the weekend and see if I was happy, if I was, he would take it back to independant garage and have the work done.

When collecting the car, after a few hundred meters, the car began;

• really rough idling (shaking)
• misfiring extensively;
• smell of unburnt petrol;
• EPC light coming on while car under load;
• loud running (sounded like turbo whine)
• check engine light started flashing;

I pulled off road where safe and looked under the bonnet. The sound reminded me of a loose HT cap off my motocross bike, (dont ask what made me think of that). So I removed the plastic engine cover to see if I could visibly notice a loose coil pack/Spark Plug etc. I noted that the pipe to the right of the coil packs On top of the manifold was not connected. (presuming vac pipe).

See attached picture (circled in red);

It appears that this was loose when collected from independant and came away when I left seller dealership.

I pushed the pipe back onto its connector and it clicked into place. I started the car and the rough idle was almost totally gone. (There are occasions where it feels like the engine skiped but aside from that, the running of the engine was now almost perfect.

I took it for a test drive and the only remaining concern was the following; (this remains the fault to date)

When accelerating from low revs and under load, as the car passes through 1,000 – 2,000 rpm, at around 1,500 rpm it will misfire and jerk once. The EPC light will trigger but only for 1 second and as the acceleration continues the car performs perfectly with no sign of any issue.

The issue is most prominent in traffic or town driving, with constant stop start driving.


Action taken so far

The car, while driving it over that weekend, ran well and did not appear to have the misfire issue when I first set off. The Check engine light actually cleared, but once the car was warm and reached its operating temp of 90 degrees the 1,500 rpm misfire returned and the EPC light triggered for a second, putting the check engine light back on.

I connected my OBD2 (Torque) to the car and checked for fault codes. It provided me with P0341 – Powertrain Camshaft Position Sensor ”A” Circuit Range/Performance (Bank 1 or Single Sensor).

I cleared the fault off the ECU, and drove the car ensuring that I did not come through 1,500 rpm under load, (setting off in 1st at 2,000 rpm). The EPC light and misfire does not happen when this is done.

I rescanned the ECU, and no fault code was present. I reached traffic and the misfire occurred, accompanied by the EPC light for 1 second. I pulled over immediately after the EPC light and misfire without triggering it again and rescanned the ECU.


Fault code P0341 - Powertrain Camshaft Position Sensor ”A” was now a pending “yellow” fault. The check engine light had not returned, however it is my understanding that with pending faults, the ECU will wait until the issue reoccurs a set number of times in a specific cycle before triggering the check engine light.

Coil Packs and Spark Plugs


Following posts on here, I had my seller provide/fit four brand new coil packs and spark plugs into the car and whilst noted improved performance, once the engine reaches temperature (90 degrees) the 1,500 rpm misfire and EPC light for one second returned, the issue does not occur until the engine reaches temperature.

Timing Chain Replaced

As this did not fix the issue, under warranty returned the car to the Independant who changed the timing chain for a new one. What a difference in the car, feels brand new. The engine is so quiet compared to before, so I'am satsifed that the chain was probably stretched.

Changing the chain has cured the misfire/lurch issue however.... the EPC light still flashes on for 1 second as I go through 1,500 rpm under load.

So in short.... everything appears to be fixed. However when the EPC light triggers even just for a second, it registers P0341 Powertrain Camshaft Position Sensor ”A” Circuit Range/Performance (Bank 1 or Single Sensor) again as a pending fault.

In summary I have;

changed all four coil packs and plugs;
cam position sensor changed;
timing chain replaced:

But despite fixing nearly everything and feeling fixed. I still get this EPC light flash and P0341..... Can anyone out there help?
 

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Discussion Starter #2
Updated: Cam Sensor, Crank Sensor and Cam Adjustor all replaced. Still getting the EPC light 1 second flash, P0341 code and sadly a slight lurch/misfire.

Wondering it anyone has any ideas. Throttle Body? ECU?

Thanks
 

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It could be a worn camshaft but that would be a guess. It needs some expert diagnosis.

Sounds like something is not right with the timing during acceleration under load.
 

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Have you had a carbon clean done? Worth doing on a tfsi engine
 

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Discussion Starter #5
It could be a worn camshaft but that would be a guess. It needs some expert diagnosis.

Sounds like something is not right with the timing during acceleration under load.
Thanks! That sounds an expensive job. It's under warranty which is fortunate but just frustrating with it being such a weird problem.
 

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Discussion Starter #7
Apparently after eliminating the common causes of P0341 (timing belt, sensors, coil packs and plugs) it is something to do with oil pressure under load and that this engine has not had the consumption fix Audi rolled out.

Engine is fine to run for now so it's booked to have the work done next week.

Once fixed il get the details of what it was so hopefully it might help someone else in future.
 

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EPC, engine light & Oil consumption problems: A5 2010 2.0 TFSI

I am having the same problem with my 2010 2.0 TFSI 77k on the clock as well as high oil consumption, out of warranty. Took it to Audi Victoria (London)after EPC and engine light came on. They investigated and advised the spark plug and engine coil on cyclinder1 needed replacing as it was aftermarket, once this was done they drained the oil and filled up for the oil consumption test, they advised to drive for 649miles and bring the car back or if any lights come on. I drove the car for a day and half approx. 45miles and the EPC and engine light came back on, the oil reading 3/4 of litre down on MMI. Took it back today they ran it through and codes came up relating to the spark plugs and blocked injector the original symptoms can also relate to a faulty spark plug/engine coil hence the misdiagnosis as nothing came up before relating to the blocked injector and they had cleared and updated the software after replacing the engine coil and spark plug, they test drove it, nothing came up on the dashboard so assumed the issue with the EPC and engine light had been resolved. They will be investigating it further, stated this issue needs to be recitified before stage 2 of the oil consumption test can be carried out.

Makes sense, a faulty/blocked injector can cause oil consumption however the rate the oil is burning is not normal. The engineers agreed there is an obvious oil consumption problem and requires Piston and conrod rebuild but Audi won't fix or contribute if other engine faults are not fixed to bring the car upto factory standards.

It might be worth getting the fuel injectors checked for each cyclinder. If the problem is an injector issue then most likely you should replace all as a new one can burn out if the other ones are old.

Let's see what Audi come out with next week....
 

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Discussion Starter #9
UPDATED **ISSUE APPEARS FIXED**

After a good while.chaisng down this fault, it has turned out to be the Cam bridge. They showed me the part they exchanged and the tiniest bit had collapsed/blocked and would not let enough oil through to sort the timing.

Hence the skip and the quick flash of the EPC light.

I've given it a run and put it through the process that would normally replicate the fault and nothing. The car also feels much better and smoother.

I will keep an eye on it, but will be back if the fault returns!
 

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Have you got a part number or a pic of this 'cam bridge' as ive never heard of this part
 

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Discussion Starter #11
Have you got a part number or a pic of this 'cam bridge' as ive never heard of this part
Hi, I'm afraid not. I almost took a picture of it too.

Best description would be it looks like the side of a motocross bike engine casing with fins on the inside to direct oil into this tiny hole. The hole itself was the problem as it can get clogged or the lining of the hole can collapse.

If I find a link to the part il post it.
 

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Discussion Starter #12
Have you got a part number or a pic of this 'cam bridge' as ive never heard of this part
Hi Morski, I found it.

This isnt my exact part, but this is what they showed me today, mine was almost identical other than the hole is considerably smaller (possibly a seal is in there, circled in red) but the issue was that hole was blocked not allowing the oil through.

https://www.ebay.com/itm/New-Camshaft-Bridge-Bracket-fits-VW-Golf-Beetle-Passat-Audi-6-Q5-06H103144J/272120164862?epid=20007491727&hash=item3f5ba031fe:g:9HgAAOSwVtZaCoSz&vxp=mtr
 

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Happy that you found a solution pal cos these problems can go on for almost ever!!!!
 

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Hi junior

I’ve been having exact same problems with my A5 2010 2.0 TFSI.

I’ve been back and thought trying to tackle this issue I read you thread won’t would you advise moving forward so I can bring the car back to life again.
 

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SOLVED: A5 2010 2.0 TFSI Chasing down an EPC Light

Hi and welcome to my thread.

I apologise now for the length of the post (but i hope it shows ive been using pointers off here before just asking for help). If you make it to the end.... you might be the hero I'm looking for!

Ive been reading this site for a while now and taken some guidance, but after a series of attempts to resolve my issue... I'm stumped.

Recently purchased my 2010 A5 2.0 TFSI 100K Miles - Has a warranty from my car seller extended to 15 months. (14/13 months left)

Before purchase

The car had a check engine light on. (turned out to be P0341 Camshaft Position Sensor - Circuit Range/Performance Bank1/Single Sensor) Car seller agreed to have the car fixed and it was sent to independant Audi specialist to have the work carried out.

Seller advised that Independant replaced the camshaft position sensor, which did not correct the fault and then replaced the manifold, which appeared to have corrected the fault. MOT completed and car returned to sellers dealership.

Check engine light returned onway back to sellers dealership. Seller advised me and I agreed with dealer that I would run the car over the weekend and see if I was happy, if I was, he would take it back to independant garage and have the work done.

When collecting the car, after a few hundred meters, the car began;

• really rough idling (shaking)
• misfiring extensively;
• smell of unburnt petrol;
• EPC light coming on while car under load;
• loud running (sounded like turbo whine)
• check engine light started flashing;

I pulled off road where safe and looked under the bonnet. The sound reminded me of a loose HT cap off my motocross bike, (dont ask what made me think of that). So I removed the plastic engine cover to see if I could visibly notice a loose coil pack/Spark Plug etc. I noted that the pipe to the right of the coil packs On top of the manifold was not connected. (presuming vac pipe).

See attached picture (circled in red);

It appears that this was loose when collected from independant and came away when I left seller dealership.

I pushed the pipe back onto its connector and it clicked into place. I started the car and the rough idle was almost totally gone. (There are occasions where it feels like the engine skiped but aside from that, the running of the engine was now almost perfect.

I took it for a test drive and the only remaining concern was the following; (this remains the fault to date)

When accelerating from low revs and under load, as the car passes through 1,000 – 2,000 rpm, at around 1,500 rpm it will misfire and jerk once. The EPC light will trigger but only for 1 second and as the acceleration continues the car performs perfectly with no sign of any issue.

The issue is most prominent in traffic or town driving, with constant stop start driving.


Action taken so far

The car, while driving it over that weekend, ran well and did not appear to have the misfire issue when I first set off. The Check engine light actually cleared, but once the car was warm and reached its operating temp of 90 degrees the 1,500 rpm misfire returned and the EPC light triggered for a second, putting the check engine light back on.

I connected my OBD2 (Torque) to the car and checked for fault codes. It provided me with P0341 – Powertrain Camshaft Position Sensor ”A” Circuit Range/Performance (Bank 1 or Single Sensor).

I cleared the fault off the ECU, and drove the car ensuring that I did not come through 1,500 rpm under load, (setting off in 1st at 2,000 rpm). The EPC light and misfire does not happen when this is done.

I rescanned the ECU, and no fault code was present. I reached traffic and the misfire occurred, accompanied by the EPC light for 1 second. I pulled over immediately after the EPC light and misfire without triggering it again and rescanned the ECU.


Fault code P0341 - Powertrain Camshaft Position Sensor ”A” was now a pending “yellow” fault. The check engine light had not returned, however it is my understanding that with pending faults, the ECU will wait until the issue reoccurs a set number of times in a specific cycle before triggering the check engine light.

Coil Packs and Spark Plugs

Following posts on here, I had my seller provide/fit four brand new coil packs and spark plugs into the car and whilst noted improved performance, once the engine reaches temperature (90 degrees) the 1,500 rpm misfire and EPC light for one second returned, the issue does not occur until the engine reaches temperature.

Timing Chain Replaced

As this did not fix the issue, under warranty returned the car to the Independant who changed the timing chain for a new one. What a difference in the car, feels brand new. The engine is so quiet compared to before, so I'am satsifed that the chain was probably stretched.

Changing the chain has cured the misfire/lurch issue however.... the EPC light still flashes on for 1 second as I go through 1,500 rpm under load.

So in short.... everything appears to be fixed. However when the EPC light triggers even just for a second, it registers P0341 Powertrain Camshaft Position Sensor ”A” Circuit Range/Performance (Bank 1 or Single Sensor) again as a pending fault.

In summary I have;

changed all four coil packs and plugs;
cam position sensor changed;
timing chain replaced:

But despite fixing nearly everything and feeling fixed. I still get this EPC light flash and P0341..... Can anyone out there help?
May i know are u settle the problem? I also have a some problem.
 

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Anyone can help? I already replace camshaft, cam bridge,timing chain,oil pump,screw valve also same problem return. Hope some one can help me tq
 

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EPC, engine light & Oil consumption problems: A5 2010 2.0 TFSI

I am having the same problem with my 2010 2.0 TFSI 77k on the clock as well as high oil consumption, out of warranty. Took it to Audi Victoria (London)after EPC and engine light came on. They investigated and advised the spark plug and engine coil on cyclinder1 needed replacing as it was aftermarket, once this was done they drained the oil and filled up for the oil consumption test, they advised to drive for 649miles and bring the car back or if any lights come on. I drove the car for a day and half approx. 45miles and the EPC and engine light came back on, the oil reading 3/4 of litre down on MMI. Took it back today they ran it through and codes came up relating to the spark plugs and blocked injector the original symptoms can also relate to a faulty spark plug/engine coil hence the misdiagnosis as nothing came up before relating to the blocked injector and they had cleared and updated the software after replacing the engine coil and spark plug, they test drove it, nothing came up on the dashboard so assumed the issue with the EPC and engine light had been resolved. They will be investigating it further, stated this issue needs to be recitified before stage 2 of the oil consumption test can be carried out.

Makes sense, a faulty/blocked injector can cause oil consumption however the rate the oil is burning is not normal. The engineers agreed there is an obvious oil consumption problem and requires Piston and conrod rebuild but Audi won't fix or contribute if other engine faults are not fixed to bring the car upto factory standards.

It might be worth getting the fuel injectors checked for each cyclinder. If the problem is an injector issue then most likely you should replace all as a new one can burn out if the other ones are old.

Let's see what Audi come out with next week....
Any good news?
 
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