Can an incorrect battery installation or reverse polarity in my Nissan Xterra truck cause damage to the knock sensor or the fuel sending unit

35

Asked by Oct 10, 2012 at 07:15 AM about the 2002 Nissan Xterra SE Supercharged 4WD

Question type: Maintenance & Repair

Dear Car Guru,

A mechanic jump started my 2002 Nissan Xterra S/E (Super charged) 4X4 SUV a few months back and incorrectly installed the battery blowing up a couple of fuses and caused several violent sparks. Immediately following the incident, my truck's "Check Engine Soon" light lit up and I found out that the knock sensor and the fuel sending unit were not functioning properly. Can an incorrect battery installation or reverse polarity on my Nissan Xterra truck cause damage to its knock sensor or the fuel sending unit?

Gerry Rodriguez

2 Answers

In a word, Yes. It can. Hooking a jumper cable up backward can and will cause all sorts of damage to electrical components. That is not to say it caused the fuel sending sending unit to short out and go out, but it seems too much of a coincidence that it happened right then. If this guy was a professional mechanic that installed the battery and/or jumped it, ask for any money you paid back, and for him to pay ANOTHER mechanic to repair all damage. If they refuse, there are several options to poke him with a sharp stick, so to speak, including but not limited to small claims court. If it comes to that be sure to bring along another mechanic to be a witness. But before you take it that far, try the Bureau Of Automotive repair in your area, the BBB, and get 100 of your friends to make signs and picket the place. Just kidding on that one.

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1,060

yes it can fry the computer and give false codss

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