Q: Why does my oxygen sensor heater stay in not ready mode on my 2002 Cadillac Escalade

asked by on

It's smog time in California and my car has no error codes in the ECU what so ever but no matter how many GM drive cycles I do and cold start idles, the Oxygen Sensor Heater won't go from NOT READY to READY. I have a scanner and this is the only sensor besides the EVAP which is incomplete. Any idea on what do do about this o2 heater.

My car has 281404 miles.
My car has an automatic transmission.

Hello. If you have performed the necessary driver cycles and have not lost battery voltage or reset the computer at any time then you either have a problem with the heater circuit of the sensor or the computer is failing. I usually test the heater circuit first as it will not set a code if it is working, but just not reaching the right temperature. Keep in mind that this does take quite a few drive cycles to complete. If the circuit is fine then the computer should be reflashed and then replaced if it does not take care of it.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Why does my oxygen sensor heater stay in not ready mode on my 2002 Cadillac Escalade

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: 1- Jerk at highway speeds and coolant guage goes crazy when this happens. 2-Truck starts accelerating randomly when idleing.

Hi There, It sounds like you may have a couple of different issues. The jerking reaction and random acceleration problem is likely related to a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake...

Q: My car DRL program is for outside north America and not working at all . How to activate it?

If you are having issues with your DRL system not working, some of the components of the system may have failed causing this to happen. The first thing to check would of course be the switch to make sure that...

Q: Heat issues

The first thing to check why it runs hotter at idle is to see if the coolant is full and there are no leaks. You may need to have a cooling system pressure test if system is low on coolant...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.