midlifecrisis91

How hard is it to change to O2 sensor on 91' L98 and where is it located?Does the car have to be on ramps to access it? TAL... :smash:

1990CORVETTE

:lurk: :yesnod:

BowTieBlood

Should be very easy I would think. Screw them in before/after the catalytic convters. Probably lift the car with a jack and loosen a clamp or the entire exhaust, lower it down and put them in? :confused: That's my best educated GUESS.

ZD1

You definitely need to lift to car a little bit to get to it. The sensor will be on the driver's side on the Y-pipe just below the junction between the manifold and the Y. If you haev snake eyes (the super human ability to look around objects in dark spaces) you see the sensor just below (12-16") the brake master cylinder/resovior.

The sensor unscrews will a 3/4" or 20-22mm wrench. The problem will be getting that wrench in that tight of a spot. Or you can join the buy a tool to use it once club an get yourself a socket designed for O2 sensors...sears will probably have it.

Go ahead and start spraying the mating surface with WD-40 as it will be pita to get it off.

LOL

midlifecrisis91

I shall investigate location and hopefully identify any PITA situations that might lie in store for me. Thanks for the help.. :D

cash's90

I replaced the O2 sensor on my '90 L98 recently. You can reach it from the top (it's located above the pre-cat on the aft side of the left exhaust header)and replace it without raising the car. Take a look and you'll see how accessible it is.

Dixie91

I have replaced the O2 sensor on my 91 auto. It is a fairly easy job. Like the other posts just jack up your car. The O2 sensor is located on the driver's side exhaust pipe. Just unscrew and replace with a new one! It's that simple. Good Luck!!!!!!!1 :thumbs:

vinnies87

changed my 87, lift or stands,, driver side exhaust, sprayed it with some Bp Blaster , unsecrew and replace,,,, i did put some anti-sieze on the threads just in case i had to replace again... easy job... :thumbs:

okinawa86vette

:iagree:
There's nothing to it. Just unplug, use an open end wrench to loosen it, thread the new one in and plug it back in.

Including jacking the car up(I've always done it from underneath) it won't take you but 15 minutes at the most.

Chris

QuikZilver

Be careful putting anti-seize on O2 sensors, it could wipe it out quicker. Most already have an anti-seize compound on the threads to keep this from being necessary. Also, do not touch the end of the O2 sensor that goes into the exhaust. The oils from your hands or dirt from your hands can cause the O2 sensor to read false. Sorry Vinnie...just wanted to warn about doing what you did. Hope you don't experience any problems with your O2 sensor.
:steering:

midlifecrisis91

Thanks Ya'll...