The engine light is on and reads P0172 (too rich). What is the fix?
Apr 29, 2008 at 10:28 AM
2001 Volkswagen Jetta ECM code P0172
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P0172 Rich Mixture, Typical symptoms of an engine that is running rich (too much fuel, not enough air).
Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
Apr 29, 2008 at 11:00 AM
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