Question about 1993 Mitsubishi Galant

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1999 galant o2 sensor

Replaced the 02 sensor...reset the computer..even disconnected the battery but the check engine light still comes on? I even drove the car 90 miles after I reset the computer?but still came on

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Have you had the car scanned for codes? the light could be on for something other than the o2 sensor

Posted on Oct 15, 2008

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Check engine light came on. scan said was O2 sensor. replaced O2. after trying to reset computer using scanner and disconnecting battery terminal, check engine comes back on after driving a few. code

The problem has to be fixed first.
The code probably did not say "replace sensor" but rather that the signal from the sensor was out of range.
The real problem could be the fuel system or other things.
What is the actual trouble code and vehicle info ?

Sep 05, 2014 | Cars & Trucks

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Egr valve replaced and check engine light still on

You may need to disconnect the battery for 60 seconds to get it to reset.

May 13, 2014 | 2008 Buick Lacrosse

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2010 Toyota Tundra, 22k miles, all dash lights flashing!

have you tried removing the battery terminal/disconnecting the battery for couple of minutes so the computer can reset.

Dec 07, 2013 | 2003 GMC Yukon Denali

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I already replaced front 02 sensor and still have 02 sensor codes

I'm pretty sure there are FOUR O2 sensors on my 2002 Escape. Two on the drivers side and two on the passenger side. At least that is what Auto Zone told me. Take the vehicle there and have them run a diagnostic. My #2 sensor on the passenger side was bad. You might also try disconnecting the negative battery cable and see if the check engine light goes out. That should also reset the computer and you may no longer get the code.. Then again, I could all wet.

Apr 11, 2013 | 2002 Ford Escape

1 Answer

2002 MR2 fuel system too rich bank 1 and bank 2

Peter. The dealer did diagnose the problem. They said the car needed all 3 oxygen sensors replaced. They were replaced and the car is now returning codes p0172 and p0175 which are the only 2 codes coming up when the check engine light came on. My question is if the dealer sold me the incorrect oxygen sensors could this cause the computer to incorrectly set the p0172 and p0175 rich fuel mixture codes. There are no other codes coming up. My plan at this point is to check and clean the MAF, check my fuel pressure, and also the TPS but I did not want to waste my time if it could possibly be that the new oxygen sensors where the problem. Any help would be appreciated.

Jan 21, 2013 | 2002 Toyota MR2 Spyder

1 Answer

My 96 maxima wont pass emissions in az after replacing 02sensor and knock i need to drive it to reset comp?

I would say 10 to 20 miles would be enough to tell if the trouble codes will return. You may be able to disconnect the battery for a couple of hours to clear the codes, but using a scanner or code reader is better.
A scanner or code reader can find history trouble codes on some models and in some cases without the engine light being on.
The purpose of the warning light is to tell the driver the vehicle needs attention now.

Aug 04, 2012 | 1996 Nissan Maxima

1 Answer

Cant get check engine light off .. fix one thing then other stuff turns it on. Now back to original code for o2

no not the computer when you get codes like that its something else first check your ground straps on the car and your battery make sure your connection are clean then reset you computer and see if that fixed it .

Apr 25, 2012 | 2002 Ford SVT Focus

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Check engine light 2005 gmc sierra 1500

try disconnecting your battery undr your hood..then reconnect.

Feb 28, 2012 | GMC Sierra 1500 Cars & Trucks

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The check engine light comes on and it dies on occasion. It is intermittent. Had it scanned and was told the only fault was mass air flow sensor. Cleaned the mass air flow sensor, replaced fuel filter and...

Anytime you make a change to any part of the emissions system, its best to disconnect the
battery for a few minutes. If you don't, the computer retains the fault code and it will usually keep
coming back. When all power is lost to the computer, it will do a complete scan when reconnected
and engine started. Try disconnecting the battery for a few minutes then reconnect and see what happens.

Mar 05, 2011 | 1992 Buick Century

1 Answer

Replaced both 02 sensors on 2003 honda element engine light still on drove vehicle 50 miles

The CEL will not turn off by itself. You have several options.

1. Take it to a dealer to clear the code, which will cost $50.00 to $100.00, depending on where you live.

2. Purchase a code reader (Actron makes a couple of nice models for about $150.00), and you'll have it for any future needs.

3. Find a friend who as a code reader and will let you use it.

4. Disconnect the negative terminal of the battery for about 5 minutes. This is a ****-shoot as you can't be certain that the CEL is on because of the O2 sensor. If it was on for some other reason, the light will just come back on after you've driven a few miles. Also when you disconnet the battery, you will need to reset your radio. You should find the reset code on a sticker in your glove box.

Jul 23, 2010 | 2003 Honda Element

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