I have a problem with my 2001 Volkswagen Jetta 2.0L, I just clean the MAF. clean the air filter and check the muffler and still the light on what can it be
P0170 Fuel trim malfunction Bank 1
Some of the cause for a P0170 that gets overlook are the crankcase ventilation system any leak there will cause a P0170 this includes the oil dipstick
A broken oil dipstick shaft will cause a P0170 as well as any leaks with the crankcase system
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