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

1 Answer

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

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

2 Answers

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

Check engine came on I replaced the o2 sensor. check engine light

You need to know what codes you have stored
Your O2 Sensor, may not be the problem,even though you get an O2 Code. That may just be the symptom

May 31, 2010 | 1993 Dodge Caravan

2 Answers

Check engine light on after OXYGEN SENSOR FIXED, which was the reason the engine light was on at all. But now its been fixed and reset and the light comes on! What the problem???

Can't solve that here What codes do you still have? Who did the O2 R&R,and was it okey for awhile? You may not have an O2 issue,even though you get the codes. A Misfire will set a lot of unrelated codes on some vehicles

I hope you understand that codes, do not tell you what is wrong or what to replace. They can be sensors out of range over a period of time and the PCM sets a code, so you can check things out.
Even a mechanical issue,could appear as sensor failure
Was the correct sensor replaced?
Do you have high Fuel Pressure,driving the O2?
What do tail pipe emissions tell you?( Exhaust Gas Readings)

May 06, 2010 | 1999 Dodge Durango

1 Answer

What makes "check engine" light come on

a code stored in the computer will tell you what system triggered the check engine light.
The most common is an o2 sensor or evap code set off by a loose or faulty gas cap.after the vehicle is started about 50 times with no fault the light will go out.You can disconnect the battery for 1 minute and reset the computer,and unless the fault is still there,the check engine light will not come back on.Before you do this make sure you have the radio code handy,disconnecting the battery will lock out the radio on most new vehicles.

Apr 13, 2010 | 1999 Toyota RAV4

1 Answer

1999 Protege, need to reset internal comp.

there are more then 1 o2 sensor find out if is a upstream or downstream sensor before installing remove the battery cable this will reset the computer

Mar 03, 2010 | 1999 Mazda Protege

1 Answer

02 sensor

does ur vehical have one or more codes and or 02 sensors

Feb 09, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

99 galant check engine light

temporarly disconnected the battery.

Oct 15, 2008 | 1993 Mitsubishi Galant

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