chilixj99

Check engine light came on. Had a mechanic read the codes and it showed that the O2 sensor behind the cat was bad. Replaced sensor, check engine light is still on. Should it have gone off, or do I need to have the code's cleared?

TrekkerJmm

Try disconnecting the battery for a few minutes and it should shut it off...Tj

98 JeepJeep

X2 this clears all saved data and forces the computer to "re-learn" everything.

shawnmf

Good ol jeeps Just Empty Every Pocket haha but u got love em

chilixj99

thanks guys, I'll try that tomorrow. The O2 sensor was easier to change than I thought it was gonna be. Just had to let the old one soak in some wd40 for a few min so I could break it loose.

jinx

reset the ECU


1. Disconnect the battery by removing the positive battery cable. Remember, the positive battery cable.
2. Ground the positive cable to the negative cable for 30 seconds to erase the electric charge in the capacitors.
3. Reconnect the positive cable to the battery.
4. Turn the key to on but do not start.
5. Turn the headlights on.
6. Turn the headlights off.
7. Turn the key off.
The ECU has been reset to factory conditions. For the first 50 warm-up periods the ECU will re-learn the engine and driving habits for your driving conditions and the newly installed parts.

89PBR96

On my 99 it called for a the downstream o2 and the guy sold me the wrong one so i ended up having to replace both but yes i had to unhook the battery also to clear my code