DTC P0171, P0172, P0174, P0175: Rear Bank (Bank 1) Fuel System Too Lean/Rich; Front Bank (Bank 2) Fuel System Too Lean/Rich

NOTE: If some of the DTCs listed below are stored at the same time as DTC P0171, P0172, P0174, and/or P0175, troubleshoot those DTCs first, then recheck for P0171, P0172, P0174, and/or P0175. P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor P0133, P0153, P1172, P1173, P2195, P2197, P2237, P2238, P2240, P2241, P2243, P2245, P2247, P2249, P2251, P2252, P2254, P2255, P2627, P2628, P2630, P2631, P2A00, P2A03: Air fuel ratio (A/F) sensor (Sensor 1) P0134, P0135, P0154, P0155: Airfuel ratio (A/F) sensor (Sensor 1) heater P0137, P0138, P0139, P0157, P0158, P0159, P2270, P2271, P2272, P2273: Secondary HO2S (Sensor 2) P0141, P0161: Secondary HO2S (Sensor 2) heater P2646, P2647, P2648, P2649: VTEC system P0401, P0404, P0406, P2413: Exhaust gas recirculation (EGR) system P2279: Intake air leakage

Check the fuel pressure (see FUEL PRESSURE TEST ).
Is the fuel pressure OK?

YES - Check the valve clearances and adjust if necessary (DTCs P0172 and P0175 only). If the valve clearances are OK, replace the injectors (see INJECTOR REPLACEMENT ), then go to step 2.

NO - Check these items:
- If the pressure is too high, replace the fuel pressure regulator (see FUEL FILTER REPLACEMENT ), then go to step 2. If the pressure is too low, check the fuel pump, the fuel pressure regulator, and the fuel feed pipe, then go to step 2.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions:
- Engine coolant temperature above 158°F (70°C)
- A/T in D position
- Drive at a steady speed between 25-55 mph (40-88 km/h) for 5 minutes, then drive at a steady speed between 15-75 mph (24-120 km/h) for 15 minutes.
NOTE: DTC P0171, P0172, P0174, and/or P0175 may take up to 40 minutes of test driving to set. Use the HDS to monitor the long term fuel trim (LT FUEL TRIM) or air fuel feed back AVG (AF FB AVG) for 15 minutes of driving. If the fuel trim/AFAVE stays within 10% of 1.0 (0.0%), there is no problem at this time.
Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0171, P0172, P0174, or P0175 is indicated, go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .

NO - Troubleshooting is complete.