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P1391 p1392 are codes that mean rough road and performance, I had theses codes on my 96 trooper and I replaced the front brake pads cause 1 caliper was not releasing and causing drag also greased universal joints and it stopped the vibration that puzzled me to extreme . This is what I did to fix the problem I had maybe this will help you as it can be numerous of things

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12y ago
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Q: What does code p1391 mean on a 1996 Isuzu trooper?
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