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2001 Eurovan - Diagnostics Help for a P0172 DTC
Have a P0172 DTC stored (Rich fuel mix condition indicated) in the ECU (2.8L VR6 engine). Eurovan runs good but won't pass emissions test until all DTCs are cleared.
This indicates to me a probable faulty O2 Sensor. How do I determine that as a fact? Is there a way to measure the O2 sensor performance or at least identify which of the 2 sensors is bad? Thanks for the help! Tom |
Welcome to the forum Tom. http://i10.photobucket.com/albums/a1.../VWwelcome.gif
VAG Error Code: 16556/000370 EOBD II Error Code: P0172 Fault Location: Fuel Trim, Bank 1 - System too Rich Possible Cause: Malfunction Indicator Lamp (MIL)(K83) active. Excessive Fuel Consumption. Irregular behaviour Fuel system. Excessive fuel pressure. Leaking or contaminated fuel injectors. Leaking fuel pressure regulator. Low fuel pressure or running out of fuel. Vapour recovery system. Air leaks after the Mass air flow (MAF) sensor. Faulty Mass Air Flow (MAF) Sensor (G70). Engine Coolant Temperature Sensor (G62). Vacuum leaks. Improper seated engine oil dipstick. Stuck Exhaust Gas Recirculation (EGR) valve. Oil overfill. Cam timing. Cylinder compression. Activated Charcoal Filter Solenoid Valve 1 (N80). Fuel pressure. Injector(s). Exhaust leaks before or near Heated Oxygen Sensors (G39). Read Measuring Value Blocks (MVB). At idle Adaptive value < -5.02%. At part load Adaptive value < -21%. When is the code detected?: Fuel injection system does not operate properly. The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.) Description: With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the Engine Control Module (ECM) judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic). As taken from my new https://volkswagenforum.com/forum/ge...oftware-34973/ |
A handful of Possibilities
According to that description, a P0172 has many possible causes. It's not going to be an easy fix. Guess I'll start by looking for air leaks and cleaning the MAF. Thanks
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