Question about Jeep Grand Cherokee

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Have a code 51 on my 1993 jeep grand cherokee any thoughts on what to look for ( the code is for a lean condition but if i floor it it blows black smoke?)maybe a temp sensor?

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P0051 DTC trouble code may be caused by one or more of the following: A short in the heater circuit in the sensor, A failed O2 sensor heater, Wiring/connectors broken/frayed leading to sensor and/or relay, or a failed PCM/ECM Most likely fix is to replace the air/fuel (O2 oxygen) sensor #1 on bank 2 (the side of the engine that doesn't contain cylinder #1).

Posted on May 26, 2010

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Great SUV, I too have one '93 GC Limited; this 51 mean "O2S Stays Below Center (lean air/fuel ratio). O2S input indicates Lean during engine operation".

Usually represents a MEM-CAL, PROM, or ECM Error (Faulty or Incorrect Calibration). Just adjust.

Posted on May 26, 2010

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