Following a battery change the Malfunction Indicator Light (MIL) in my 2005 Nissan X-Trail came on and the engine went into "limp" mode. After checking on-line, I found that the computer on the X-Trail could be re-set by removing certain fuses for a short time. Feeling very clever, I did this, and sure enough, the MIL went off and the car came out of "limp" mode. However, it was noted by my "cyber guru" that if the fault were more serious, the MIL would come back on - which it did! Are you aware of any On-Board Diagnostic code reader I can obtain for my car so that I can identify and rectify the problem without the necessity of going to the dealer?"
I'm not aware of any affordable equipment you could purchase to diagnose problems at home. If you want to save money you could use an independent service agent who would generally charge much less than the dealer.
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