Question about 1999 Toyota Tacoma PreRunner

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Problem after restarting the computer

The check engine light was on. at advanced auto parts they ran a test and it said fuel too lean so they told me to restart the computer to get the light off. so i did and when i started up the truck it sounded bad and wouldnt do anything i couldnt even rev up the engine. finally it would move. now for 3 days when i get in for a quarter mile it moves slow then kicks in and drives good but sometimes on take off it runs slugish

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What was the code? P-0171? If so, you may have a very dirty Mass Air Flow Sensor. This is held onto the intake tube by 2 small screws. Take it out & look down inside it. You will see a couple of silever wires. Are they fuzzy-looking? If so, clean them with some brake cleaner spray. Reinstall, and check for a dirty air filter. Hope this helps

Posted on Sep 16, 2008

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The car is shaking at 40 to 50 km/h and 90 to 100 km/h


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Trac Off light and Cooling Fan running on my 2001 Chevy Cavalier


I had the same problem on my 2001 Sunfire (same car as the Cavalier-different branding) which I was able to fix successfully.

My symptoms were:
-Traction Control OFF light illuminated
-Cooling fan running even if engine cold and it was freezing outside (I also noticed that when the Traction light illuminated, the fan would then begin)
-Rough idle with black smoke when cold
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I have a code reader which produced codes P0130 and P0171. These are error codes for the upstream oxygen sensor (the one under the hood).

I simply replaced the O2 sensor (it took me 10 minutes). I did not reset the check engine light after the repair as I wanted to see what the car would do on its own. The idle was much smoother with no smoke and the cooling fan stopped running unnecessarily. After 1/2 mile down the road, the Trac light went away and the system functioned normally. I tested this by trying to accelerate quickly up a snowy driveway. I also noticed that the acceleration and shifting (auto tranny) were smoother. I reset the check engine light. All is satisfactory.


What was happening to the car before the repair:

P0130 is usually for a bad O2 sensor and P0171 is the sensor detected that the motor was running too lean (but it actually wasn't-the sensor was essentially giving a false lean signal).
The rough idle, black smoke, and poor economy are due to running too rich. In my case, the sensor told the PCM (the car's computer) that the air/fuel mixture was too lean. In response, the computer said "OK, more gas!" That's why it ran rich. This was evidenced on the old O2 sensor as well...it was completely caked with carbon from an excessively rich mixture. This further destroyed the performance of the O2 sensor.

Nov 04, 2013 | 2001 Chevrolet Cavalier

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My 98 Buick LeSabre is spitting & sputtering. Seems like it is choking and coughing. There are some popping sounds & a smell that is different than straight gasoline. When it first started doing this,...


Before you said you didn't want to put $ into a new oxy sensor, I was thinking that was the problem. Vacuum hoses may be a part of it, but I am not too familiar with them causing the kind of sputtering you are talking about. When did the change occur? It may be a fuel pump, but it sounds complicated enough to have a real mechanic look at it.

Oct 15, 2013 | 1998 Buick LeSabre

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I have 1998 Pontiac Bonneville 6 cylinder, I went Advance Auto because my check engine light came on and they told me it was PO171,Bank one system too lean. Yesterday, I use Seafoam and flush the fuel...


chances are the 02sensor needs replacing,the bank 1 is the exhaust system that cylinder 1 is on the motor and is threaded in the exhaust system.

Sep 16, 2011 | 1998 Pontiac Bonneville

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My 1998 Ford Windstar said service engine soon. I had the oil changed and tune up at one of those Quick Kar Lube. The attendant did a scan and told I needed a Max Air sensor. I later replace it a...


What you need to do is check all the vacuum lines. Listen fro a hissing noise. it is leaking some where. Any time there is a MAF, and both 02 sensors pop a code, this is the first thing to check. And fords seem to leak the most.

Sep 05, 2011 | 1998 Ford Windstar

1 Answer

Check engine light is on. don't have an owners manuel


There are many reasons for a check engine light to come on. If you are near a large auto parts store they will ususally hook it up to a computer and tell you what code is setting off the check engine light. The most common cause for a check engine light is a vacuum leak. This will usually show as an "engine lean" code. Meaning your engine is getting too much air in comparison to the normal amount of fuel. However, bad catalytic converter, faulty oxygen sensors, faulty exhaust gas recirculator, faulty positive crankcase ventilation valve could all be bad. It is too expensive to just replace everything, so getting the correct code from Autozone or Advance auto parts is important.

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2000 kia sportage trouble code po171 once in awhile,runs lean when cold,ok warm. i have 2 of these cars, changed over , map, tps ,idle sensors. also changed fuel injectors, filters ,fuel pump,fuel pressure...


I have 2005 Kia Sportage with a check engine light. No other symptoms. I was told by Kia and Local mechanic that it is the fuel injectors. Error Code states that Fuel injectors are running lean. Put Master airflow- no change. Ran engine test with propane to run rich and trim never changed from 15. Car runs great. Kia dealer said that this is because we use Ethel in gas that it effects the alumium fuel rail delivery to the injectors and that it is necessary to change all of them .Kia Dealer wants $1,000.00 deposit to place order 6 fuel injectors from Kia. (Has anyone heard of that?)Also put fuel injector cleaner in tank.Does anyone have any suggestions before I spend over $1,000.00 to replace all 6 injectors or possible idea of what could be wrong?

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3 Answers

2006 pontiac g5 pursuit


The onboard computer has detected a problem.

If still under warranty (emission related, up to 50K by government mandate), take to dealer. If not sure, take it to autozone or other auto parts store and have them hookup computer and printout the error code.

NOTE: If fuel cap is not on tight, it will set an error code. Can take several days to reset after correcting the gas cap.

Jul 31, 2009 | 2006 Pontiac G5

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