Question about Ford E-250
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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Posted on Jan 02, 2017
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