2001 QX4 "Service Engine Soon" lamp on steady

Could be, it's a good guess. Without scanning you won't know.

or worse....could be an oil change

Or somewhere that can read the codes. The price varies too much to say what it would cost where you live, call around. Otherwise you're just guessing. Remember though sometimes what the computer spits out isn't exactly what is wrong and someone familiar with the car would now how to read the results. Smart people cost more money. ;-)

I'd go to the dealer unless you know of a good shop that really knows that vehicle.

How about the gas cap being loose?

It remembers for the last 50 engine on/start/run//off cycles!

But the gas cap was just one example off how minor the item causing the light to come could be. It could be something else, only a scan will tell. The other way is to short the engine check terminals on the check connector. This will make the MIL flash the fault codes without needing a scan tool. As a previous poster has said how you interpret the codes is another matter. Take the gas cap example, it will come up as a fault in the evap system, the 1st reaction would be to change the carbon canister and clear the code. This would be a big expense to cure the user error of removing the gas cap while the engine was running. As such an abuser is likely to do it again the fault will reapppear so they will be in and out of the shop getting new carbon canisters and slagging off Nissan, when really they need a quite discussion about their dangerous and environmentally unpleasant refueling habits.

If the engine is in really big trouble like the AFM has died it goes into limp home mode and won't exceed 2800rpm.

-- Peter Hill Spamtrap reply domain as per NNTP-Posting-Host in header Can of worms - what every fisherman wants. Can of worms - what every PC owner gets!

Have a 99 pathfinder. My light came on around 32,000. Checked gas cap and other things. I went to the dealer and it about $50 to diagnose. Came out to be 2 rear oxygen sensors were bad. I knew the service manager and he said there was a service bulletin about it and had to replace the O2 sensors and reprogram the computer. That didn't cost me. He told me though that it was around $300 per sensor. I would argue with them, if it is the O2 sensors. Their was another guy who had the same problem during the same time as me and the service department did his work before the bulletin came out and he paid out of his pocket.

Try google or google groups for old postings on this.

-- Peter Hill Spamtrap reply domain as per NNTP-Posting-Host in header Can of worms - what every fisherman wants. Can of worms - what every PC owner gets!

Dude, why are you even fuc*ing with it, the dang thing is under warranty.

Take it to the dealership and let them worry about it, did you even read the warranty coverage booklet that came with the truck, obviously not

It has 74,000 miles.

On the Warranty information I found

1. Basic Coverage 48m/60,000miles
2. Corrosion coverage 84m/unlimit
3. Powertrain coverage 72m/70,000
4. Federal Emission performance warranty 24m/24,000
5. Federal emission defect warranty 48m/60,000
6. Federal emission long term defect warranty 96m/80,000
7. California emission performance and defect warranties 36m/50,000
8. California emission long term defect warranty 84m/70,000

The only warranty is still good is #6 above. Does the " Federal emission long term defect warranty" cover my problem?

Limp home sounds evil - engines like the E15ET do not produce power until

3000RPM at least, and cruising at safe open road speed would be very difficult with the 2800 limit...

Oh well - good thing you should never need it. :-)

Nick.

a dirty air filter will cause this on a nissian/infiiti