Engine codes advisory on MOT 2.7T Petrol
We have a 2.7T V6 Petrol A6 Avant which has been throwing up some codes that I would really appreciate some help with.
Here are the codes as taken from the printout from the garage...
P1459 Exhaust gas temperature sensor 2 signal improbable.
P1136 Additive mixture adaptation for air (Bank 1 sensor 2) System too lean.
P1138 Additive mixture adaptation for air (Bank 2 ) System too lean.
P0300 Combustion failure detected faulty (which I think should actually read 'Random/Multiple Cylinder Misfire detected)
P0306 Combustion failure detected cylinder 6 faulty
P0302 Combustion failure detected cylinder 2 faulty
I have tried to look up the first 3 codes here...
OBD II Fault Codes
The 3 top codes don't seem to correspond with the descriptions on this site. Is that right?
We had initially thought that the issue was the O2 sensor/s.
After doing some reading on here, it would appear that it could simply be the fuel type, as we have been using 97RON rather than 99.
Alternatively would the injectors be worth looking at ahead of the O2 sensors?
Any input would be greatly appreciated.