Question about 1990 Cadillac Eldorado

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Code 51 what does it mean

What does it mean ecm error

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PCM defective

Posted on Mar 21, 2014

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Posted on Jan 02, 2017

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Ignition bypass error.42,incorrect MEM-CAL 52.

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12 51 55 codigo de error


12 just means the system was reset recently 55 mean end of codes so don't worry about them 2 however code 51 is an oxygen sensor error (O2 Sensor) a bad or shorted O2 sensor can cause it to run very bad and get poor gas mileage.

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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?


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).

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