Did a scan on my MK1 Octavia VRS after having some lumpy idle/ juddering boost.

 

Quite pleased that only 5 codes came up in total for a 14 year old car! :p 

 

HOWEVER...

 

Maybe because Im Irish...but Im confused by the following codes...

 

17545 - Fuel Trim: Bank 1 (Add)

            P1137 - 35-10 - System too Rich - Intermittent

17536 - Fuel Trim; Bank 1 (Mult)

            P1128 - 35-10 - System too Lean - Intermittent

 

If its running too rich AND too lean, whats the real issue?

 

I also had...

 

16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit 

 

 

 

Could it be that errors 17545 and 17536 are caused by 16514, and by replacing Lambda sensor, all 3 will be beaten into submission?

http://wiki.ross-tech.com/wiki/index.php/17545/P1137/004407

 

http://wiki.ross-tech.com/wiki/index.php/17536/P1128/004392

 

http://wiki.ross-tech.com/wiki/index.php/16514/P0130/000304

 

There does appear to be linkage to the Lambda probe there, although the probe code is for heating circuit.

Thanks Phil

It also came up with coolant temperature sensor faulty, so have ordered a new one. As its a common prob with VAG I figured I may as well as its bound to go at some stage.

Would replacing the coolant sensor perhaps eliminate the lambda error and by extension the others? Maybe it's a case of doing things one by one until the problems dissipate!

The heating circuit for the oxygen sensors lives under the floor on the drivers side, so I would think it is unlikely unless you have had a short for some reason.

Fuel trim (add) is at idle, Fuel trim (mult) is off idle at all other engine speeds