How tell a bad o2 sensor?? - DSM Forums: Mitsubishi Eclipse, Plymouth Laser, and Eagle Talon Forum: DSMtalk.com
 
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Old 09-13-2009, 02:11 PM   #1
grizzlyburr
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How tell a bad o2 sensor??

Hey guys I'm just curious to know how you can tell if your o2 sensor is bad.

Thanks a lot
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Old 09-13-2009, 03:00 PM   #2
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Re: how tell a bad o2 sensor??

1st clue would be a cell light. Like P1035 "o2 Sensor Heater Circuit Malfunction"
Sensor 2 is not important.
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Old 09-13-2009, 03:06 PM   #3
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Re: how tell a bad o2 sensor??

Well, you have two O2 sensors, and the best clue is if you get a check engine light. If you don't have a reader (I have a ScanGuage II mounted above my RR mirror that gives me all sorts of extra engine data, including the ability to read a CEL and also to clear them without disconnecting the battery), you've have to take the car somewhere to have the CEL read.

P0170- generally means front sensor (just below turbo) has gone bad. I had this CEL and replaced the front O2 sensor, it hasn't re-ocurred.

P0173- generally means rear sensor (after catalytic convertor) has gone bad.

Trouble codes on your car, go to 95 Eclipse (Turbo) 96-98 Vehicles OBD2: http://www.troublecodes.net/mitsu/

There are other trouble codes that show if your O2 sensor heater has crapped-out.
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Old 09-13-2009, 03:25 PM   #4
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Re: how tell a bad o2 sensor??

You can also physically check it by using these directions http://www.paladinmicro.com/PalMO2Sensors.htm
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Old 09-13-2009, 09:52 PM   #5
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Re: how tell a bad o2 sensor??

Okay that makes sense because i have a "service engine soon" light on. I'm also getting sub par gas mileage lol
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Old 09-14-2009, 01:11 AM   #6
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Re: how tell a bad o2 sensor??

Quote:
Originally Posted by grizzlyburr View Post
Okay that makes sense because i have a "service engine soon" light on. I'm also getting sub par gas mileage lol

Pull the trouble code and see what it says instead of ASSuming because I did that and replaced a good o2 just to find out the bad gas milaege was from a loose coolant sensor connection. In my case I even used Chilton's intructions to test the o2 but either chilton or I screwed up leading to believe the o2 was bad. Fyi I also replaced a good TPS sensor years ago with oem from local dealer for $105 after using chiltons instructions testing that one too so idk anymore about chilton. Now that was back before dsm forums, ebay, or easy access to the internet so don't get on my back for going to my local dealer for parts

Somebody mentioned oxygensensors.com and that's where I got mine for $50 and borrowed the tool from autozone to change it out which is an easy job. Just make sure you need one tho

Last edited by 91Bluebird; 09-14-2009 at 01:16 AM.
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Old 09-14-2009, 10:51 AM   #7
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Re: How tell a bad o2 sensor??

Most part stores like Advanced Auto and Checker will read your codes for free, most likely they'll tell you what the code means, as well.
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Old 09-14-2009, 11:32 AM   #8
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Re: How tell a bad o2 sensor??

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Originally Posted by 93_GSX View Post
Most part stores like Advanced Auto and Checker will read your codes for free, most likely they'll tell you what the code means, as well.

True but any self-respecting dsm'er would pull codes themselves and can do it in less time

If it is your oxygen sensor and you're tight on cash you can try cleaning the sensor 1st by letting it soak in ?gasoline? ??kerosene? (not sure which is best) because the holes on the sensor get clogged with carbon deposits. Also the car is quite old so you should check your connection at the o2 and make sure it's making good contact.
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Old 09-14-2009, 01:51 PM   #9
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Re: How tell a bad o2 sensor??

Alright I'll go to Checker and see if they can read it for me. If it does end up being the o2 sensor I'll try cleaning as suggested below.

Thanks for all the help,
Micah
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