S3 engine running lean

[Mattjbradbury]

Hi guys.

My engine management light keeps coming on (then switching itself off a couple of days later) but its currently in the garage getting a boot catch replaced and they have informed me this is because the engine is running lean. (They only ran a initial diagnostic, they don't know why and i'm not prepaired to pay loads to fix it just before xmas!)

On the MOT it almost failed on emissions until they put cleaning agent through the engine. I think the 2 are related. Any other people had issues with this and the cause and possible fix?

Thanks,

Matt

 

[jcb]

you need a VAGCom scan.
could be something as simple as a crapped out MAF

why did they put a cleaning agent through it if they hadnt done a full scan?

 

[Mattjbradbury]

Sorry the MOT was done a couple of months ago before the engine light started coming on... and the quick fix was cleaning agent rather than a Scan and it passed the MOT after the agent.

 

[finesse]

the error code from the garage would be good, read these

wiki.ross-tech.com/wiki/index.php/Fuel_Trim_Info


Taken from the Ross - Tech Wiki
17536 / P 1128 /004392 - Fuel Trim ; Bank 1
( Mult) : System too Lean
Possible Symptoms
Malfunction Indicator Light ( MIL ) active
Possible Causes
Mass Air Flow ( MAF ) Sensor faulty
Oxygen Sensor Control faulty
Oxygen Sensor ( s ) faulty
Fuel Injector ( s ) faulty
Possible Solutions
Check Mass Air Flow (MAF ) Sensor
Check Oxygen Sensor Control
Check Oxygen Sensor ( s )
Check Fuel Injector (s )

 

[Mattjbradbury]

Thanks guys. So its likely to be a sensor fault. Already had a thermostat sensor fault on the car, they seem to go down like flies!