I recently bought a very clean 02 impala that was draining the battery in a 3 hour span. I disconnected the amp in the trunk and cured that problem.
I discovered the harness to the radio had been cut and spliced into instead of using an adapter harness and suspicioned it had something to do with the battery drain when I heard the amp pop the speakers when I disconnected the battery and the radio didn't shut off when I opened the door.
The oil change and traction light flashes constantly and was told the gas gauge doesn't work right. Today it stalled out at about 20 MPH and knocked like a major timing issue when it restarted so I scanned it when I got home. P1361 and P1362 Both are supposed to be tied to either the crank sensor or the ICM.
I didn't get an owners manual with it so I'm at a loss at how to deal with the oil change light. I have another radio harness to splice back in with the original radio and another ICM to try but don't think that'* going to fix my flashing light problem.
Any thoughts or ideas where to look would be greatly appreciated. Thanks in advance. Joaa

I read somewhere else on the internet that you can access the oil-life setting through the display and controls on the radio. Hearing that the radio has been rigged various ways would seem to go hand-in-hand with this. Perhaps undoing all of the supposed improvements will resolve this?

Either way, many GM cars, I believe yours included, can reset the oil life monitor by:

1. turn on the ignition but DO NOT start the car
2. depress the accelerator pedal to the floor three times within five seconds

That having been said, I don't know if your flashing [oil change] light is actually indicating that an oil change is necessary or if it is indicating trouble of some other sort.

I tried a different ICM and erased the codes and drove it for an hour. Not stalling anymore and the oil light must of reset with it before I got the message how to reset it other wise.
The security light is on but not flashing and I got a crank sensor and O2 sensor code after I got back. Next I'll change the crank sensor and put the harness and original radio back in but that'* going to be awhile. My slack time just ran out and the customer always comes first. Maybe next week.
Meanwhile any volunteers to replace all five wheel studs on a 04 Taurus on the side of I -380 13 miles south of Iowa City? Thank God they're on the passenger side and thanks CathedralCub for the input

Great to hear it'* running again. Thanks for letting us know how it turned out. Good luck with the Taurus!

Hardest part to the Taurus was getting under it to jack it up. Tomorrow afternoon I'll be working on the Impala hopefully and I'll let you know how changing the crank sensor works out.

Runs exceptionally well with the new crank sensor and I found abs sensors disconnected on one front and one rear wheel now the traction light and abs lights are off.
I drove it for the first time last night and the dash lights don't work either. I haven't changed the radio back yet so I'll look into the dash lights then. Poor thing no tlc for quite awhile.