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Hi All,

I am new to this so please bear with me, I will give as much info as I can think of but if you need more please advise me on what you need to help me. :smile2:

I picked up a 2011 RS5 with 64k on the clock last week, it has a full service history, all with Audi except the last one. Upon collecting the car as usual it came with only a quarter of a tank so I filled up straight away at the nearest garage, unfortuantely they did not have any 99 octane fuel so I settled for the normal 95 ron, said inside the petrol cap that this would be ok so I continued filling up with the intention of using 99 ron on future fill ups. I drove the car home (200 mile journey) and had no prblems at all, no coughs, no splutters, no lights, no nothing other than what I expected, smooth driving.

I went out in the car the following morning and within 10 minutes the orange check engine light came on, interestingly the fuel gauge was in almost exactly the same place as it was when I filled it up the day before a quarter tank. I took the car to my nearest Audi specialist who ran a VCDS diagnostic scan, this showed a number of misfires on several cylinders but the frequency was only once, I told him about the fuel the day before and he said it could be down to the lower octane fuel. He suggested a bottle of cleaner and also a bottle of advanced engine lubricant, both put into the fuel tank, one at half a tank and the other at a quarter tank, I had filled up with 99 ron priot to going to the garage but the bottles have since been put in. He cleared all faults, seen with my own eyes.

All ran perfectly when leaving the garage and for a further 150 miles until this morning, when at almost exactly the same fuel level the orange check engine light has come back on!:frown2: I have ordered some new plugs and intend to do an oil change and air filter change as well. Chap at the garage said it may come back on before any poorer fuel is properly purged and if that did happen to go back and he would reset for free, cant say fairer than that.

So, I guess my question is does anyone have any ideas as to what maybe causing this? Thanks in advance for any help you maybe able to give.

Richard
 

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Registered
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Hi All,

I am new to this so please bear with me, I will give as much info as I can think of but if you need more please advise me on what you need to help me. :smile2:

I picked up a 2011 RS5 with 64k on the clock last week, it has a full service history, all with Audi except the last one. Upon collecting the car as usual it came with only a quarter of a tank so I filled up straight away at the nearest garage, unfortuantely they did not have any 99 octane fuel so I settled for the normal 95 ron, said inside the petrol cap that this would be ok so I continued filling up with the intention of using 99 ron on future fill ups. I drove the car home (200 mile journey) and had no prblems at all, no coughs, no splutters, no lights, no nothing other than what I expected, smooth driving.

I went out in the car the following morning and within 10 minutes the orange check engine light came on, interestingly the fuel gauge was in almost exactly the same place as it was when I filled it up the day before a quarter tank. I took the car to my nearest Audi specialist who ran a VCDS diagnostic scan, this showed a number of misfires on several cylinders but the frequency was only once, I told him about the fuel the day before and he said it could be down to the lower octane fuel. He suggested a bottle of cleaner and also a bottle of advanced engine lubricant, both put into the fuel tank, one at half a tank and the other at a quarter tank, I had filled up with 99 ron priot to going to the garage but the bottles have since been put in. He cleared all faults, seen with my own eyes.

All ran perfectly when leaving the garage and for a further 150 miles until this morning, when at almost exactly the same fuel level the orange check engine light has come back on!:frown2: I have ordered some new plugs and intend to do an oil change and air filter change as well. Chap at the garage said it may come back on before any poorer fuel is properly purged and if that did happen to go back and he would reset for free, cant say fairer than that.

So, I guess my question is does anyone have any ideas as to what maybe causing this? Thanks in advance for any help you maybe able to give.
Visit Autoguysland to view what we should do when check engine light on but no codes,
Richard
I don't much about car, but according to what i searched, it could be caused by something as simple as a loose gas cap or a faulty oxygen sensor or spark plug or something as severe as a faulty catalytic converter or major engine problems. you can refer this link to view if you can figure out the issue or not. Hope it helps
 
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