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Thread: Front and Rear 02 Sensors OBD1

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    rawr. verified Feedback Score 4 (100%) Atrosity's Avatar
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    Front and Rear 02 Sensors OBD1

    I need to replace both of mine. What size are they and how do I take them off?
    vroom vroom i drive a 93 toyota mr2.

    https://car.social

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    http://stealth316.com/2-oxygensensor.htm

    I was able to get the front off using an open end wrench from underneath without removing anything else.
    . 1992 VR4 - Java Black Pearl paint (2004 STI) with combo '92/'96/'99 custom front end .
    . Fittipaldi Force or 5Zigen FNO1-RC wheels . Cianci rear strut bar . K&N intake . DNP pre-turbo hard pipes . DNP hard intercooler pipe kit . Greddy Type RS BOV (recirc) . HKS EVC Black Limited boost controller . Vacuum reduction with all silicone pluming . EGR block off plates . Hot wired fuel pump . AEM AFPR @the rail with Robbeck adapter . Fuel rail loop . Tanabe knockoff down pipe . No cats . Single Turbo Flamer full 3" cat back . RPS Max pressure plate with street disk . Seattle92VR4 solid motor mounts . '99 Lifters . R1 Concepts slotted rotors . Supercar Engineering brake caliper stiffening bolts . HHH data logging . Red Line fluids .

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    rawr. verified Feedback Score 4 (100%) Atrosity's Avatar
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    Thanks for that. The size is 7/8" on the hex of the sensor.

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    Ya almost all 02 sensors including the AEM ones are 7/8. Some of the autozone type non-OEM replacements are wierd sizes though.

    -Ricer Evo 8: 8.75 @ 166 Best MPH of 167. Quickest 4G63 Powered Evo in The US!!!
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    And the list goes on...

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    I can not get my front sensor to come loose, I am about to strip it, what do you guys do?

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    Member verified Feedback Score 2 (100%) blindmist's Avatar
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    Is there no way for you to impact it? Hit the wrench with a hammer? You might need to try that 50/50 ATF/Acetone mix and tell us how it works.

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    I need to use a flared wrench,

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    you trying with an open end wrench? since you are getting rid of them cut off the connector if you cant fit the wrench over it, and use the closed end. Otherwise try and pick up an 02 sensor socket form a parts store, they work well for breaking them loose.

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    Yeah I just bought an o2 sensor socket and pb blaster to see if this does the trick. Thanks for the help guys..3sgto ftw.

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    Rice Patrol verified Feedback Score 0 Mean Green's Avatar
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    I used the autozone rent a tool O2 sensor remover tool. Worked great!

    I replaced my o2 sensors with these:
    http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWNX%3AIT

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