System too lean
#1
System too lean
Hi
I have 96 Audi A4 2.8 Quattro 115k miles.
The CEL came on with the following code: 16558 P0174 Fuel Trim, Bank 2 System Too Lean. I cleared the code but it came back again. The car backfires quite a bit when deacelerating. Other than that it feels fine maybe a little underpowered. I ran some Techronfuel system cleaner andalways used premium gas. I did the air filter and the spark plugs recently.
Any suggestions?
I have 96 Audi A4 2.8 Quattro 115k miles.
The CEL came on with the following code: 16558 P0174 Fuel Trim, Bank 2 System Too Lean. I cleared the code but it came back again. The car backfires quite a bit when deacelerating. Other than that it feels fine maybe a little underpowered. I ran some Techronfuel system cleaner andalways used premium gas. I did the air filter and the spark plugs recently.
Any suggestions?
#6
RE: System too lean
Usually it's the mass air flow sensor. Not knowing that motor wellit could also be the upstream 02 sensor. Ruling out the 02's means getting an electrical diagram, disconnecting the harness that feeds the sensors and creating a short at the 02 sensor wires in some manner. There is detailed information on one of the Audi forums, just don't remember where.
#7
RE: System too lean
mostlikely mass air sensor.....mine gives almost the same code but its bank 1 thats too lean ....i took it to the dealer and after i gave them 100 bucks they told me that i needed a new one www.ecstuning.com and you can get a bosh mass air sensorfor i think $115
#9
RE: System too lean
ORIGINAL: TROMOa4
mostlikely mass air sensor.....mine gives almost the same code but its bank 1 thats too lean ....i took it to the dealer and after i gave them 100 bucks they told me that i needed a new one www.ecstuning.com and you can get a bosh mass air sensorfor i think $115
mostlikely mass air sensor.....mine gives almost the same code but its bank 1 thats too lean ....i took it to the dealer and after i gave them 100 bucks they told me that i needed a new one www.ecstuning.com and you can get a bosh mass air sensorfor i think $115