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Discussion Starter #1
Hi guys
I have just had the engine mgt light come on my car is a 2011 Audi s5 with 68000miles on the clock I plugged it in to find the below fault codes could someone please point me in the right direction as to what I need to do car is just about to have a full service inc plugs not had since 40k could it be down to carbon ? Any advice would be brilliant just don’t want to go spending a fortune
OBD2:
P2198 (confirmed) - O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 1
P2098 (pending) - Post Catalyst Fuel Trim System Too Lean Bank 2
P2198 (pending) - O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 1

CAN network gateway:
03041 - Energy Management Active

Ignition authorization:
00956 - Key 2
00955 - Key 1

Engine:
P0599 - Thermostat Heater Control, Circuit High
P2098 - Post Catalyst Fuel Trim System, Low Limit
P2198 - O2 Sensor Signal Bank 2 Sensor 1, Biased / Stuck Rich


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I would recommend checking in with a specialist as a lot of those codes could be caused by the Thermostat which is also mentioned. I had an issue where my car would seem to lose power at higher revs and the EPC light came on. A few different errors but the specialist I spoke to near me said it's quite common for the Thermostat to cause many issues and replacing it does the trick. Sure enough, it did but it's a pretty intensive job, looking around £800.
 

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Paratroop mate get yourself a VCDS product or go to someone who has one, cos they are deffo worth their weight in gold! I personally would have the full service cos its well overdue plus a VCDS check and you may solve everything, if not at least the VCDS scan will point you in the right direction. Good luck.
 

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O2 sensor 1 controls the fuel trims the post cat or O2 sensor 2 monitors the cat perfomance. The post cat O2 is saying it is too lean likely because the O2 sensor 1 that controls the fuel trim is faulty and leaning the car out because it thinks its too rich.

You are likly at -25 trims and the car may also be having a few misfires because its really lean and not rich that the sensor is telling it
 

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Discussion Starter #6
Thanks guys I have booked her in for a full service and asked if they can inspect the sensors and take it from there thanks again ??
 

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Hey mate come on how did it go, do you have a happy ending then.....
 

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Discussion Starter #8
Sorry had a full service all filters and plugs.
Not had a light back on as yet seems to be running fine all locked away at the moment with our current lockdown.
need to get it back on reader to see if anything comes up ??
 

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Good news indeed well done we LOVE a happy ending!!! Stay safe mate and best of luck!!!!
 

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Cheers mate same to you ??
If it comes back let us know. For ma part it was the High Pressure Fuel Pumps (HPFP) that were wormed out. The check engine only came on after a long hwy drive. Ex: You drive for an hour or so at hwy speed (120km/h) stop to do some shopping with the wife and jump back in the car to drive back home and BAM! There she is, the orange check engine light ;) Same code patterns as you P2098, P2198 & P2098. Here the clip I found showing the fix, the guy also gives you the needed part numbers for the fix.


Cheers,
Martin
 
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