P0171 (Bank 1 of 2) code on 2005 Accord Hybrid - Drive Accord Honda Forums

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Old 01-12-2011, 09:54 AM
aabragan aabragan is offline
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P0171 (Bank 1 of 2) code on 2005 Accord Hybrid

I have been looking around on forums to see what the cause of the code P0171 (1 of 2) - System Too Lean (Bank 1), might be and from what most people say, it is the Front O2 Sensor that has to be replaced. If this is the case, can someone tell me where the front O2 sensor is located on this model (2005 Honda Accord Hybrid V6) and if there are 2 front O2 sensors or just 1. If there are 2 front O2 sensors, should I replace both. Also do I need any special tools to replace this sensor?

Any and all help is appreciated.

Thanks in advance!!
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Old 01-13-2011, 02:13 PM
drozzin drozzin is offline
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Test procedure

Here is a write up procedure on this code for my car (HAH 2007).
I hope it will be the same for your car (2005).

DTC P0171: Rear Bank (Bank 1) Fuel System Too Lean

DTC P0172: Rear Bank (Bank 1) Fuel System Too Rich

DTC P0174: Front Bank (Bank 2) Fuel System Too Lean

DTC P0175: Front Bank (Bank 2) Fuel System Too Rich

NOTE:


•Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
•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. P0101, P0102, P0103: Mass air flow (MAF) sensor
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: Air fuel 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
P0522, P0523, P2646, P2647, P2648, P2649: Variable Cylinder Management (VCM) system
P0401, P0404, P0406, P2413: Exhaust gas recirculation (EGR) system
P2279: Intake air leakage



1.Check the fuel pressure. Is the fuel pressure OK? YES - If you are troubleshooting DTC P0171 or P0174, go to step 2. If you are troubleshooting DTC P0172 or P0175, check the valve clearances and adjust if necessary. If the valve clearances are OK, replace the injectors, then go to step 2. NO - If the pressure is too high, replace the fuel pressure regulator;'06-07 models, then go to step 2. If the pressure is too low, check the fuel pump, the fuel feed pipe, and the fuel filter. If they are all OK, replace the fuel pressure regulator; '06-07 models, then go to step 2.
2.Turn the ignition switch ON (II).
3.Reset the PCM with the HDS.
4.Do the PCM idle learn procedure. See: Programming and Relearning
5.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.
6.Test-drive under these conditions:
•ECT SENSOR 1 above 158 F (70 C)
•Transmission 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 80 minutes of test driving to set. Using the HDS, monitor the long term fuel trim (LT FUEL TRIM) or the air fuel feed back average (AF FB AVE). If the long term fuel trim/air fuel feed back average stays within 0.08 - 1.20, there is no problem at this time.



7.Check for Temporary DTCs or DTCs with the HDS. Is DTC P0171, P0172, P0174, or P0175 indicated? YES - Go to step 1. NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.




PCM Idle Learn Procedure


1.Make sure all electrical items (A/C, audio, lights, etc.) are off.
2.Reset the PCM with the HDS.
3.Turn the ignition switch ON (II), and wait 2 seconds .
4.Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 194F (90C) .
5.Let the engine idle for about 5 minutes with the throttle fully closed. NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes .
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Old 01-13-2011, 02:20 PM
drozzin drozzin is offline
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O2 sensor location

Here is location picture for O2 sensors. There are 4 of them (two for each engine bank)
You will need a Special Tool: O2 sensor socket wrench. Snap-on YA8875, SP Tools 93750, or equivalent, commercially available
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