Jim Grant's Tech Tips
Jeep Cherokee, O2 Sensor Light Still On
Q: I recently changed the oxygen sensor on my 88 Jeep Cherokee.
The problem is that darn light on the dash that is still lit. It shows
the emission maintenance light on. So, how is it turned off without dismantling
the instrument cluster? Hopefully there is an easier solution than the
one for the 89 Isuzu pick-up or is it the same automotive engineers working
on the JEEP?
the instrument panel and to the right of the steering column is a little
black box called an Emissions Maintenance Timer. If your Jeep has cruise
control it will be hiding behind the cruise control module. There are
no screws to turn or buttons to push, you just throw it away and install
a new one! Just that easy.
"80s and early 90s car manufacturers had many weird
configurations to alert the vehicle operator of recommended service. In
my opinion the best was found in Dodge trucks. There was a 9 volt battery,
yes a 9 volt battery buried in the dash. At just about 80k the battery
went dead causing a warning light to come on. The fix was a new battery
and resetting a switch. The trick was figuring out where they hind that