Question about 2001 Volkswagen Jetta TDI

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2001 Jetta 1.8T 172 engine code

I have a 2001 Jetta 1.8t with an enige code of 172, running rich. Anyone had this problem, I've been told it could be the O2 sensor or the mass air flow sensor. Any ideas.

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You may just have a dirty MAF sensor, spray brake clean through the sensor and clear the code, run it a few days to see if the code comes back.

Posted on Sep 16, 2008


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Have you had the O2 sensors checked ? Code 172 is for a rich signal from bank one sensor one and code 156 is for a problem with bank two sensor two which is after the catalytic converter.
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Leave the downsteam ones alone

The 172 is rich ,so maybe you have a
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Engine light on with restricted performance. I've scoped the issue and get a reading of PO 172. I've cleaned sensor and changed air filter. Still get restricted performance and check engine report....

this code is a rich code your car is burning too rich...meaning not enough air is mixing with the fuel...make sure you check all lines insuring that bank one doesnt have a clogged vacuum line etc..Bank one is where cyllllinder one is located or usually if your facing the bell housing while sitting in the car it will be the right side of the engine...But I would start with hoses,then go from there...

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What does the code 172 mean for a 2005 GMC Canyon?

it means that your fuel is running too rich,and needs more oxygen for a cleaner burn. i think that your oxygen sesor may be faulty,but have autozone run the trouble codes for you,and see what exact part is bad.

May 02, 2010 | 2005 GMC Canyon

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Getting a code 172 rich fuel cond 1.9 liter it has had a new cat and both o2 sensors it has had a map sensor and the evap purge valve checks out. No external vac leaks are detected it has had new plugs and...

you might want to check the intake for leaks-let the engine run-while running spray some brake cleaner around the intake-if the engine boggs down or dies that means your intake gasket is leaking and needs replaced-this is very common

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2001 E250 4.2 codes po 171 174 172 175

P171 Lean to bank one
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P174 Lean to bank two
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These are conflicting codes. I would suspect that you have a bad MAF sensor. take it out and try and clean it before you replace it. It could also be a bad O2 sensor. But unlikely that both sides went bad at the same time.

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