Hello I just bought an audi s8 for not very expensive but in a bad state engine level, I can not find the fault, in fact the car does not turn round as if it did not turn on all these cylinders.

I have already done the necessary maintenance, namely new coils, new spark plugs, air filter, fuel filter, drain. A power steering return hose was tinkered, I redid it properly too. I disassembled the intake manifold there were broken intake manifold flap, and I deleted the flap, I also bought the lambda oxygen sensor corresponding to the bank 2 sensor 1 at Audi and I changed it. because I had the fault with the VCDS but the fault reappeared despite the new sensor. I have several faults in the engine computer 1 and engine computer 2 diag.



Here are the faults :



Engine control unit 1:

005715 - Read the fault memory of the ABS computer

P1653-008

006439 - Relay for Aux Coolant Pump (J496) Out of order

P1927-004



000081 - Oxygen (Lambda) Sensor B2 S1 heating circuit Short circuit to ground

P0051 - 002 - Intermittent - Indicator on



006435 - Read the fault memory of the engine control unit 2

P1923-008







Engine 2 computer:



005715 - Read the fault memory of the ABS computer

P1653-008



000768 - Misfire detected

P0300 - 001 - Light on



000772 - Cylinder 4 Misfire detected

P0304 - 001 - Light on



000773 - Cylinder 5 Misfire detected

P0305 - 008



Knowing that the oxygen sensor in question that I changed corresponds well to cylinder 4 and 5 therefore the where I have misfires.



Thanks to you if you have an idea and sorry for my english i am French.