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 FAQ: Oxygen Sensor Replacement (R) Pictures :) ....with 
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Joined: November 07 2000, 3:01 AM
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Location: Gainesville, FL USA
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Post FAQ: Oxygen Sensor Replacement (R) Pictures :) ....with
:arrow: BBCode Formatting Updated by MX-3.com, March 18th, 2006 (Photo Links Still Invalid)

Again, stolen from PT user Leska:

Replaced the rear oxygen sensor and thought I'd post pictures with instructions.

DIAGNOSIS (OBD-I Vehicles 1993-1995)

The Check Engine light was coming on and after jumping the TEN & GND pins, it was reporting Code 23 & 24......

23 RHO2S inactivation error
24 RHO2S inversion error

REMOVAL

The right oxygen sensor is located behind the engine about 4-5 below the exhaust manifold. It's a 4 wire sensor that points towards the passenger side of the car. Access to it is partially blocked by the frame crossmember (the beam on the left with the 3 holes).It looks like this....

Rear Oxygen Sensor (26KB) [LINK BROKEN]

To make this job quick and easy, remove the 6 crossmember bolts and remove the crossmember. They are quite short and have a 17mm head. Once you have it removed, I suggest using a crow-foot wrench to unbolt the sensor. The 7/8 wrench fit best. All the crossmember, bolts, suggested wrench and new sensor look like this.....

Parts and Tool(35KB) [LINK BROKEN]
The easiest access to the oxygen sensor is right through the middle of the pipes with the angled wrench head pointing left. It's a great fit and allows about 5 to turn it or hammer on it if necessary. Looks like this......

Best Wrench Angle(22KB) [LINK BROKEN]

The connector has a lever on the engine harness side of the connector that you push in while pulling the connector apart.

REPLACEMENT

Make sure to apply anti-seize compound to the threads before install. Some sensors come with it pre-applied. My replacement sensor came with a tiny tube of gold compound. Looks like this....

Applying Anti-Seize (27KB) [LINK BROKEN]

Screw it in before plugging the connector in. It's suggested to tighten to 35 ft/lbs. The sensor has a crush washer as a seal, so make sure to tighten it good and snug.

After you plug it in, reinstall the crossmember with it's six bolts. I'd suggest using Anti-Seize on these as well for future removal. Torque these bolts to 69-90 ft/lbs.

Finished product looks like this.....

New Sensor Installed (26KB) [LINK BROKEN]

A few other tools I used but are not necessary are an impact wrench and 1/2 torque wrench. I wouldn't shy away from removing the crossmember if you just have hand tools though. The bolts are short and come out rather easy on my 7 year old PGT. A 1/2 breaker bar should work fine. This is what I used....

Optional Tools (30KB) [LINK BROKEN]

Expect the whole job to take under 30 minutes after the car is jacked up. I'd say 15 minutes with an air wrench.

There you go :2thumbsup:

NOTE: Front oxygen sensor is very similar but much easier. Just remove the plastic s shaped air intake behind/above the radiator to gain access to it and the connector.

Codes associated with the Left sensor are as follows....

15 LHO2S inactivation error
17 LHO2S inversion error

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David Coleman
I used to know alot about MX-3's, but not so much anymore. Oh well.


February 09 2002, 5:03 PM
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Joined: August 27 2001, 2:01 AM
Posts: 1179
Location: Russellville, AR, USA
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Post Re: FAQ: Oxygen Sensor Replacement (R) Pictures :) ....with
Dave, maybe its my PC but I get nothing but "Page cannot be displayed" messages when I click on your photo links.

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KLZE, ZE PCM, UR pulley, PS catback, PS STS, PRM, IAC bypass, 64mm TB, FOP hair gel


February 09 2002, 5:50 PM
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Joined: January 14 2002, 3:01 AM
Posts: 51
Location: Wexford,Ireland
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Post Re: FAQ: Oxygen Sensor Replacement (R) Pictures :) ....with
Me too Dave! how do i get onto the registry?


February 09 2002, 6:05 PM
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Joined: November 07 2000, 3:01 AM
Posts: 2516
Location: Gainesville, FL USA
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Post Re: FAQ: Oxygen Sensor Replacement (R) Pictures :) ....with
Link formatting fixed.<P>Email jeff for registry information at webmaster@mx-3.com

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David Coleman
I used to know alot about MX-3's, but not so much anymore. Oh well.


February 09 2002, 6:17 PM
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Joined: November 07 2000, 3:01 AM
Posts: 2516
Location: Gainesville, FL USA
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Post Re: FAQ: Oxygen Sensor Replacement (R) Pictures :) ....with
Moved to the new V6 FAQ!

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David Coleman
I used to know alot about MX-3's, but not so much anymore. Oh well.


April 07 2002, 6:33 PM
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