Any need to d/c battery after o2 sensor install?

[scuba_steve91]

After you install a new o2 sensor, should you disconnect the battery for it to work or what. for s13 (no cel on)

[blacksrjdm]

If you didnt have CEL on then no.

[scuba_steve91]

Hmm well my car's old o2 sensor was so eroded it was practically not there. When i installed the new o2 sensor, the car ran the same, still rich and backfiring when i let off the gas.

[blacksrjdm]

Well, then if you think disconnecting the battery will help then try it, sounds to me that the O2 sensor wasnt the bad part. Sounds to me like you have a bad maf or timing is retarded or you have a boost leak. Keep digging.

[94_240sx]

When you replace any electrical parts, you should disconnect the battery anyway before you start working on it. It's been 8-9 years since I replaced mine. Should I?