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1991 Subaru Legacy L

Check engine light was on for sometime. Had a mechanic tell me that the O2 sensor needed to be replaced. The car was running great UNTIL he replaced the sensor.( The sensor he replaced is located under the hood on the left) Afterward, the car would jerk and ran like crap! Also was losing about 100 miles per tank of gas. I finally just disconnected the darn thing until I can figure out what the problem is. The car is now running great again, with the sensor disconnected. The sensor he put on has one black wire, and two white wires. My car has one red, one black, and one white or very light grey wire. Is it possible that it was wired wrong? Does anyone know the correct color connection? Also another mechanic told me that the O2 sensor is around the exaughst (spelling) and that there is a MAP sensor. Is it possible that this person did not install the correct sensor? Please help! I cannot afford to pay a huge repair fee for this. I don't want to run the car forever with the engine light on and I want to fix this ASAP. Thanks! Robin :confused:

Reply to
coldcut414
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I would start by asking the mechanic to recheck to see if the O2 sensor is the correct one and look over his shoulder while checking the book. "coldcut414" wrote in message news: snipped-for-privacy@no-mx.forums.yourdomain.com.au...

Reply to
Edward Hayes

The O2 sensor is sensing the amount of oxygen *in your exhaust flow*, so yes...it's in the exhaust.

Where did your first mechanic put this "O2 sensor"?

Reply to
CompUser

The first sensor was installed under the hood on the passenger side of the car. You can see this when you look just under the air intake. Can you tell me what sensor IS located in this area of the car?

Reply to
coldcut414

If it's a sensor mounted on the air intake ducting, it's probably your MAF or MAS--think of an air flow meter.

Reply to
CompUser

The sensor is not connected to the air intake. You can VIEW it just below the air intake. The sensor isnt connected to any part per sey, just some wires. Just sort of sets alone.

Reply to
coldcut414

I'm assuming you're the original poster, here-- I've lost track.

If you have a sensor that's NOT inserted into the airstream of the intake, and NOT inserted into some exhaust piping, that sensor is either:

a) not your MAF/MAS or O2 sensor;

--or-- b) is one of the above, but not properly mounted.

That's the best I can do, with the info given.

Reply to
CompUser

I have the same MAF problem--Same car-- what is a fair dealer price to do this job and replace same??

Reply to
Lew Rain

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