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Code 51 issues


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Pathfinder started running rough, check engine light came on. Diagnostics showed a 51, found a bad injector and replaced. Also the tuneup was overdue so replaced plugs, wires and cap. Ran good for a day then same thing happened. Engine has 160k on it, any suggestions besides rechecking the injectors? Anybody else experienced these symptions?

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I had something similar happen to me a while ago. What happened was the injector I replaced turned out to be a different style than the ones in the car (I also messed up the o-ring which just added to the headaches - so make sure you use a new one with the replacement injector, oh, I used a bit of light oil on the O ring to help it go in easily). The injectors have a blue or black dot on them, and you must match the color of the dot. I had to go to a junk yard and get one as the ones from Shucks/O'Reilly that said they were compatible did not work for me.


Hope this helps.

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