Question about Ford E-250

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My 2002 Ford E250 starts OK, but it sounds like it's missing. Upon acceleration, the engine sounds like it's running on 2 cylinders. I've had the fuel pump and sock replaced about 6 weeks ago. The mechanic indicated that the fuel filter was replaced at that time. He also indicated that he had done his best to clean sludge out of the tank, but he could not warranty his work because of the amount of stuff he found in the tank. Autozone gave me the following codes: P0136, P0156, P0171, P0174, P0302, P0305, P0316, P0420, P1131, and 1151. I replaced an incredibly dirty air filter too (thinking that it was causing some air intake problems). I thought I would replace he fuel filter again and then check the EGR valve with help from someone with a little automotive experience. I usually run the vehicle quite low on fuel because I'm on an incredibly tight budget and fuel prices are out of sight. Any suggestions are appreciated!

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  • tdmahon May 19, 2011

    Thanks for analyzing all the error codes. That helps me take the info to my shade tree mechanic to help resolve things. From the comments, things point to just one overall issue and it shouldn't be overly costly. If this doesn't work, I guess I'll be getting quite a bit of exercise on foot.


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P0136 = Downstream Heated Oxygen Sensor circuit fault - Bank No. 1.
P0156 = Downstream Heated Oxygen Sensor circuit fault - Bank No. 2.
Both this signal that the oxygen sensor on the exhaust line is either disconnected or has failed. Without it the air/fuel mixture is set too lean by the ECM, the engine misfires and the catalyst can't work properly. That is proved by the next errors
P0171 = System Too Lean - Bank No. 1.
P0174 = System Too Lean - Bank No. 2.
P0302 and 5 = Misfire Detected - Cylinders 2 and 5.
P0316 = Misfire detected on startup.
P0420 = Catalyst System Efficiency below Limit .
The actual part that must be checked or replaced is the oxygen sensor and its wiring, as warned by the last error codes
P1131 = Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1.
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2.

Posted on May 19, 2011

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