My 02 Jetta is reading that it needs a po171 sensor what is that for and will that cause the car to shake

Asked by Feb 21, 2015 at 03:01 PM about the 2003 Volkswagen Jetta

Question type: Maintenance & Repair

Well the car is shaking when I'm in driving and it pulls real  hard its automatic

2 Answers

Lean fuel air trim. Possible Vacuum leak, unmetered air entering intake. It's MAYBE a MAF sensor PCV problem See:


- Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection What does this mean? What does this mean? Tech notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced. Read more:

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