All Things Mk5 > How to Guides / Troubleshooting

Mk5 too Rich

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Vag-mk5:
Hello I am from Austria and have the error code p2178/p0172

Fuel Metering System System too rich from idle speed

Bank1

Ne colleague read it with vcds

Up to now some parts have been changed:

 
KGE
ignition coils
spark plugs
injectors
fuel filter
And little things
O2 sensor
mass airflow meter


Do you happen to have any tips on what this could be or maybe someone had an error that could help me :thinking:

LC5F:
There are a few things it could be:

PCV leak, engine is drawing in extra air, lambda sensor seas the engine running lean so adds more fuel.

Assuming your car is a Gti, it has 2 coolant temperature sensors, one for engine the other for instruments - it could be the engine one is faulty, telling the ECU that its cold pushing more fuel in.

Vag-mk5:
Hi thanks for your contribution

I'll check the temp sensor


And I recently changed the lambda probe

pudding:

--- Quote from: Vag-mk5 on May 31, 2022, 01:23:25 am ---And I recently changed the lambda probe

--- End quote ---

Genuine or aftermarket?

I've had issues with cheap aftermarket lambda sensors not reading correctly.  The only problem is, genuine ones are around £200 now!

Vag-mk5:
Yup its from Bosch the old one are bosch

Oriignal cost me 280€

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