Why does my oxygen sensor heater stay in not ready mode on my 2002 Cadillac Escalade
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.
Experienced mechanics share their insights in answering this question :
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.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
if the oxygen sensor heater monitor is not ready, check to see how many other monitors are not ready. if the oxygen sensor and catalyst monitors are also not ready, the culprit is most likely a weak battery. if your battery is more than four years old, replace it and re-run the drive cycle.
You should have coolant temperature below 50 C/122 F, and the coolant and air temperatures within 11 degrees of one another. This condition can be achieved by letting the car to sit overnight. The ignition key must not be left ON position before the cold start. Otherwise the heated oxygen sensor diagnostic may not run.
There are several potential causes of the HOS2 code: * The fuel/air ratio (or O2) sensor may be faulty. * The O2 sensor could have a faulty electrical connector. * There may be a short or other fault in the O2 sensor circuit wiring. * An oxygen sensor fuse may be blown.
The faster the oxygen sensor heats up, the quicker the PCM can enter closed loop fuel control, optimizing catalytic converter efficiency. On most OBD II systems the oxygen sensor heater monitor runs concurrently with the oxygen sensor monitor or continuously when the engine is running.
A previously-used O2 sensor should warm up in a running instrument for 60 seconds before calibration. A newly-installed O2 sensor should warm up for 5 minutes before calibration.
Can I Drive My Car With A Bad Oxygen Sensor? We recommend against driving with a bad O2 sensor as the powertrain is not running on the correct fuel mixture. While it may perform fine in the beginning, if your engine is running rich and using too much fuel it might begin to clog the catalytic converter.
A “not ready” result means your vehicle`s computer has not had a chance to check all of the parts of the emissions control system for problems – so it cannot determine if everything is working as designed. Until the vehicle is “ready” to complete the checks, the OBD inspection cannot complete.
One of the most noticeable symptoms occurs while driving. When operating your vehicle, you may notice that your engine is running rough until the exhaust becomes hot enough to activate the O2 sensor to start giving an output voltage. Rough idling and running are very common regarding this error code.
yes, there is a fuse for the o2 heaters. check all the fuses. it may also be a harness issue and needs to be checked as well.
Circuit Checks
The easiest check is to measure the resistance between the two terminals for the heater in the oxygen sensor`s connector. The resistance can range from 10-25 ohms, but check the specs. If it is open or has low resistance, it is probably the sensor.
So why is the light still on? Here`s something you probably don`t know: after clearing the car`s computer you will need to drive for about 50 to 100 miles. As you drive your car the computer will monitor all the sensors and register the results.
Oxygen sensors have to reach an approximate operating temperature between 600˚ and 650˚ F to produce valid data for closed-loop fuel control.
The O2 sensor lets the computer know if the fuel mix is burning rich (not enough oxygen) or lean (too much oxygen). Knowing the ratio of fuel to air allows your vehicle`s engine to make any necessary changes to ensure that your car runs like it should.
If the heater fails, the O2 sensor may still give feedback to the ECM but this process will take more than the standard time of less than two minutes. This can result in an engine stalling or running inadequately, increased fuel consumption, and the accumulation of carbon.
If the heater fails, the O2 sensor may still give feedback to the ECM but this process will take more than the standard time of less than two minutes. This can result in an engine stalling or running inadequately, increased fuel consumption, and the accumulation of carbon.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
Why does my oxygen sensor heater stay in not ready mode on my 2002 Cadillac Escalade
ANSWER : 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.
Smog check failed due to Oxygen sensor heater OBDII not ready.
ANSWER : Hi there. Check the fuses and wiring to the oxygen sensors on your vehicle. If they are in good shape, then the sensors would need replaced as they are not warming up to the proper temperature before registering any exhaust particulates. If you need further assistance with your oxygen sensors, then seek out a professional, such as one from Your Mechanic, to help you.
I have a bad oxygen sensor, bad power steering sensor, and a bad cam shaft sensor? Should I replace any of them?
ANSWER : When you say you have three bad sensors I can only assume you have had them tested and the end result is three bad sensors. If they tested bad then they should be replaced. The power steering sensor senses the load of the steering on the engine so it can raise the idle during parking maneuvers. The O2 sensor is used for fuel control and it may effect engine power and fuel mileage. The camshaft sensor cay cause no starts, engine running problems and all three will turn on the check engine light.
I did replace the heater core and two sensor the crank sensor and camshaft sensor it didn’t work can it be the computer
ANSWER : If the check engine light is on, what kind of codes is the system detecting? Do you have spark at the plugs? If you have spark, does spritzing some starter fluid give you a momentary startup? If so, there is a fuel issue. More symptoms and information on the car’s behavior before and after the parts you replaced would be very helpful. At this point, I would recommend an inspection from YourMechanic.com to diagnose this car starting problem, get an accurate assessment of damage and cost estimate for repairs. YourMechanic.com can dispatch a mobile, professional mechanic to your location to help you get your car up and working again.
After oxygen sensor replacement I’m getting a P1273 error. The engine starts up but won’t stay on and stalls.
ANSWER : Hi there. For the code P1273 to show up on your Nissan, there is either an issue with the fuel system or the air intake control system. Check the fuel pressure on the fuel rail and see if there is at least 55 psi. If the fuel pressure is low, then there could be an issue with the fuel pressure regulator, a clogged fuel filter, or the fuel pump not running at full capacity. If there is good fuel pressure at all times, then check the Mass Air Flow sensor (MAF) and see if it’s dirty. Also, check all of the clamps that connect to the MAF and the plumbing from the MAF to the throttle body. A leak in the intake plumbing will cause the P1273 code to come on as well. This is a symptom of the engine being too lean in the air to fuel mixture. So either there is not enough fuel or too much air. If you need further assistance with your engine stalling, then seek out a professional, such as one from Your Mechanic, to help you.
I shifted the lever to drive mode, but it goes to reverse mode. What is the problem?
ANSWER : You are very nearly right. There is a bowden type cable that connects the the shifter to the transmission. It has adjustable ends and one or more of those adjustments has probably worked loose. That or you might need a new shift cable or new bushings at the connections. Either way, you can have the problem conveniently solved by contacting Your Mechanic. They will send a technician to your home or office to check out your shifter and transmission and tell you exactly what you need to repair it. Meanwhile, be very careful with this car, it might not go into park when you expect it to so be sure to set the brake and park it very carefully.
How many oxygen sensors do I have on my 2008 Cadillac Escalade EXT?
ANSWER : Hi there – your Escalade has 4 oxygen sensors total, 1 before each of the two catalytic converters, and 1 after each catalytic converter. Diagnostic codes are usually pretty specific as to which one is malfunctioning (i.e. Bank 1, Sensor 2 for example). For assistance with replacement, I recommend an oxygen sensor replacement performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.
Were is the Oxygen sensor on a 2005 Cadillac SRX? I’m trying to fix it myself – 2005 Cadillac SRX
ANSWER : Hi, there are 4 oxygen sensors on this engine. For each cylinder bank, there is one O2 sensor just in front of the catalytic converter, and one O2 sensor just after the catalytic converter – at the front of the center muffler section of the exhaust. Check your problem codes to know which sensor(s) actually need replacement – otherwise replacing all of them will be unnecessarily expensive. I would recommend an exhaust emissions inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.
