20 Most Recent 2004 Infiniti QX4 Questions & Answers

The two main reasons are here. https://www.google.com/search?q=2006+FX35+Infiniti.+The+Speedometer+quit+working The most common reasons an INFINITI FX35 speedometer isn't working are the vehicle speed sensor (VSS), a faulty speedometer, or an electrical issue. ..

I had the same problem with my 2001 Infiniti QX 4. A common problem with the with these cars is the rear sway bar bushings go out causing it. To do that I would suggest just replacing the sway bars entirely cuz it's easier than replacing the bushings because the new sway bars come with new bushings that way you don't have to press out the old ones and press in the new ones

First off, make sure that the gas cap is tightened beyond three clicks. If it is and has been then there are many things that could be causing the light to come on. But let me start by assuring you that it is not something that requires immediate attention. The sole purpose of the service engine light is to detect malfunctions of emissions related components. If the gas cap isn't tight, the computer system detects an incorrect amount of pressure inside the tank due to vapor leaking out of the filler neck. If the cap is tightened after a period of time the computer detects the right pressure and the light will go off. However, on QX4's the most common cause of the light is oxygen sensors, or cam and crank position sensors, and finally intake valve timing control sensors or solenoids. O2 sensors measure the amount of oxygen in the exhaust gas. Normally I have seen that in damp and wet conditions these sensors are more likely to intermittenly give false readings. That being said, although the SES light is not an emergency situation, it will need to be addressed at some point, as the Engine control module takes the readings from these various sensors and automatically adjusts things like idle control, and air fuel mixture ratio, and eventually will to some point affect the performance of the vehicle. I have seen folks drive 100K miles with a service engine light on, so if you don't want to spend a 200 or so dollars right away, I would take the car to autozone, have the codes retrieved, and report back to this forum, at that point I would be able to advise you a little further. But more than likely you could continue driving the car without any driveablility issues.

Sounds like a air flow problem caused by a reaction from the cooling system warming up. Best bet have it scanned by a shop & sensors & emissions checked. good luck

check the plug clean connections maybe wiggle wires to make problem reacure my mitsubitshi does same thing its a bad connection If you need further help, I’m available over the phone at https://www.6ya.com/expert/lee_9bf2e1a3cef596dc

Idle air control valve may be getting stuck shut. Remove it and clean it as well as the throttle body idle air passages with carb cleaner.

Crankshaft and or camshaft position sensors are marginal. If they go out, you won't runs at all.

No more than othe r cars thy all wear out and it depends on how you drive and what where and how.

It's positioned near the left side of the crankshaft pulley at the front of the engine. If you slide under the front bumper you can see it and remove it from there

It is really not that difficult for an 01 qx4, and if you order the bulb online you'll save enough money that if it takes you two or three tries (and bulbs) you'll still save over what the dealer or a mechanic would charge you:
Don't touch anything on the new bulb besides the plastic base (don't touch the glass!)
1. Make sure you disconnect the battery before anything else (you don't want to get shocked by these high voltage babies). If you're replacing the passenger side bulb, take the battery out for more room to work, especially to see what's going on in there (you can undo the air filter case on the drivers side for the same benefit, again--disconnect the battery first). 2. Find and unscrew the round, black, plastic lid behind the headlight, it's up and to the left. 3. You'll see a shiny metal connector with electrical warnings printed on it and Michael Jackson glove looking wiring attached to it. Turn that gently to the left to open up access to the actual bulb (you'll now see the bottom/back of the bulb--a black circle with a small metal tip in the middle). 4. Unhook the two metal braces that hold the bulb in place (push in gently to let wire out--kind of like unhooking a bungee cord or unsetting a mouse trap). 5. Pay attention how the two divots on the bulb case line up with the little nubs at the top of the encasing (you have to put the new one in lining up the same way.) 6. You can now take out the bulb. You might consider practicing the replacement sequence with your old bulb that you just took out before sticking the new one in there--just to get the hang of it so you aren't banging the new one around. 7. Once you've got the bulb back in there just put everything else back in place in reverse order. 8. Wash those dirty hands and try turning on your lights. 9. Go celebrate your automotive victory by driving somewhere at night!