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1999 Infiniti Q45 Questions

Get answers to questions about your 1999 Infiniti Q45 at RepairPal. Find solutions, diagnose problems and get back on the road.

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26
questions

because i have changed all o2 sensors, egr valve, changed plugs & coil packs plus pcv valve and maf sensor. Car still shakes and stalls...been using premium gas since i purchased three years ago.

My car shakes a lot and I can smell the fumes and it shakes like it wants to shut off

changed throttle positioning sensor because that's what diagnostic said was a problem but still made no difference and check engine light is still on. what could it be?

the temp gauge is above hot

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I Replaced the pump and it still does it. I have also replaced the tensioner

Sometimes when I turn the key nothing happens. I have to wiggle the gear shift then it will start. The dealer says it must be in failure mode for them to diagnose the problem.

Brake light came on but went off within a minite

Says need dealer to flash ecm. Dealer says 1999 model is too old for their software??Anyone other than dealer can help?

after changing the battery the horn wont stop

in my Infiniti q45 all the instruments on the odometer will not work except for the gear sections, but sometimes while driving it will start working. what can be the problem

when I am driving car will start jerking while I am driving car. also car will cut off while I a sitting at a stop sign. check engine light is on. it is telling me maf circuit malfunction, knock sensor 1 and 2. that is it. could one of these sensors be causing car to act the way I explain. need help thank you.