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The diagnostic code 12 51 55 is actually not a code for the 1994 Jeep Grand Cherokee Laredo. The 12 means that it has started searching for codes. The 51 is oxygen sensor stuck lean. The 55 means it is finished searching for codes. Getting this means nothing is wrong.
Basically it means it means you have a invalid skim key and you are going to have to replace the i mobilizer module with new keys and reprogram.
1255 is actually 2 separate codes. code 12, and code 55. code 12 just means the battery or power source to the computer has been disconnected in the last 50 key-on cycles. 55 means it is the end of the code sequence.
Trouble code P0720 means:Output speed sensor circuit malfunction
P0725 indicates Engine Speed Input Circuit Malfunction.
The code can be cleared by unhooking the battery. The light will return if the failure is not repaired.
The computer has detected a malfunction and set a trouble code.
Trouble code P0155 means:O2 sensor heater circuit malfunction (Bank 2 Sensor 1)
P0123 TPS volts high. Replace the throttle position sensor.
The airport code for Laredo International Airport is LRD.
Error code 66 on a 1997 Jeep Cherokee means TCM to PCM failure. This code means that the transmission control model is not communicating with the powertrain control model.
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