2002 convert. saab 9-3, 56,000 miles

2 questions.
1) Is the oil actually low on the dipstick?
If it is, you might have an oil leak, so you would need to look underneath and see. Also look for puddles when you park.
The most common reason for such consumption would be a burst oil pressure switch, or a leaking valve cover gasket.
Either of these will leak lots of oil.
The last possible reasons, which are really rare, would be engine parts defective,( like oil rings), or a leak in the brake booster which would suck oil from the crankcase into the brake booster.
2) If the oil is not leaking out, and the dipstick shows full, you will be needing a new oil pressure switch, or to have the electronics repaired.
God bless your efforts.

1251 Air Temperature Internal Sensor Circuit Open



1260 Solar Radiation Sensor Circuit Short To Battery





HOPE THIS HELPS

This information should be in the manual for the car.

There is a trip botton next to your speedometer, where it it shows how many miles are on the car and how many miles you have traveled since the trip was last set. Push it in for about 15 seconds with your ignition on and then release it. It should turn off during this time. It means wherever you had your oil changed the mechanic was not very experienced or did not know what he was doing and he did not reset the trip. I would not take a car that nice to a mechanic like that again!

Well your exhaust system may still be under the 8-80 warranty, so I would check with the dealer. My 01 had 4 sensors, an upper and lower on each side. Yours has at least 2 so replacing one did not update the other, and your converter(s) may have failed. So I would start by checking your VIN with a dealer to see if you are still under the 8 year/80,000 mile warranty on the exhaust system. If not I would have them do a diagnostic on it to see what is bad.

If you changed your oil just less than three miles ago, you just need to reset the computer. In this vehicle it may be the same as other chevys. what you will need to do is turn the key to the run position. Depress on the gas pedal three times and turn off the key. this should reset the computer. good Luck

I would try changing the coolant temp sensor.

I would use original Ford parts. There are a lot of gimmicks out there, most do not work.

I have an LSE, 2002 and get about the same mileage. I added a K&N airfilter and get a little more pep on both my car and truck. They cost more, but its all cleaning once you use them.

The message light does not check all internal systems.

Have someone at a local parts store do a free code scan for you, this will tell you what code is making the light come on, and what that code indicates is wrong.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Check your muffler, is it thick black? The engine is burning oil, you need new engine if the cylinder ring is bad (compression test), and new catalytic converter that poisoned by excessive oil.

Many altima 02 has pre-catalytic converter failure that cover under 8 years/80k miles emission law. The materials in the pre-cat destroy the engine. It is well known problem and you can get new engine under this warranty