P0172 Fuel System Bank 1 Sensor 1 Rich

P0172 code - with the engine running, upstream closed loop fuel control, ambient/battery temperature above -6.7°C (20°F), battery voltage above 10.99 volts, attitude below 2590.8 m (8500 ft). Set conditions P0172 code, the Powertrain Control Module (PCM) multiplies the short term adaptive value and the long term adaptive value together. If the total corrective value is above a calibrated threshold for than 30 seconds, a fault is set. Default actions, MIL light will illuminate.

P0172 Fuel System Bank 1 Sensor 1 Rich

Possible causes:
  • Evap purge solenoid operation.
  • Bank 1 VVT solenoid driver circuit shorted to voltage.
  • O2 sensor heater operation.
  • O2 signal circuit.
  • O2 return circuit.
  • O2 sensor.
  • MAP sensor.
  • ECT sensor.
  • Engine mechanical.
  • Fuel filter/pressure regulator.
  • Powertrain Control Module (PCM).

Diagnose code P0172 Fuel System Bank 1 Sensor 1 Rich

Step 1. Check for an active DTC
Diagnose all other DTC before continuing. Check for contaminats that may have damaged an O2 sensor contaminated fuel, unapproved silicone, oil and coolant. Start the engine, allow the engine to reach normal operating temperature. With the scan tool, read DTC. It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.

Is the DTC active or pending?

Yes, go to step 2.
No, perform the PCM intermittent condition.

Step 2. Check the fuel delivery system
Perform the CHECKING THE FUEL DELIVERY SYSTEM test procedure (see Sitemaps or labels this site).

Were any problems found?

Yes, repair as necessary.
No, go to step 3.

Step 3. Check the Exhaust system for leaks
Perform the CHECKING THE EXHAUST SYSTEM FOR LEAKS test procedure this site (see Sitemaps or labels)

Were any problems found?

Yes, repair as necessary.
No, go to step 4.

Step 4. Check the engine coolant temperature sensor operation
For best result, allow the vehicle to sit long enough for the engine to cool down near ambient temperature. Turn the ignition on, with the scan tool, read the Engine Coolant Temperature degree value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature. If engine coolant temperature is above 82°C (180°F), allow the engine to cool until 65°C (150°F) is reached.

Start the engine. During engine warm up monitor the Engine Coolant Temperature degree value. The temperature value change should be a smooth transition from start up to normal operating 82°C (180°F). Also monitor the actual coolant temperature with a digital thermometer at or near the ECT sensor and thermostat positions. As the engine warms up to operating temperature, the actual coolant temperature (thermometer reading) and the scan tool Engine Coolant Temperature degree values should stay relatively close to each other.

Was the digital thermometer readings relatively close to the scan reading for the ECT sensor?

Yes, go to step 5
No, replace the Engine Coolant Temperature (ECT) sensor.

Step 5 . Check the Oxygen sensor operation
Perform the CHECKING THE OXYGEN SENSOR OPERATION test procedure this site information (see Sitemaps or labels).

Were any problems found?

Yes, repair as necessary.
No. go to step 6.

(Sorry!!! Step 6-10, refer to code P0175)
Step 6. O2 sensor 1/1 Heater operation
Step 7. Check the MAP sensor operation
Step 8. Evap purge solenoid operation
Step 9. Engine Mechanical

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