Question about 2000 Chevrolet Astro

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Check engine light is on said 02 sensors so i changed them twice.cleared codes light came back on,same codes.ichecked the grounds they are ok

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If you replaced the O2 sensors and its still having the same code, then the problem could be the catalytic converter instead of the sensor. Take the vehicle to the local mechanic and have them replace it for you.

Posted on Mar 14, 2011

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Code p0038 wont go away and i have replaced the 02 sensors twice on my 2006 kia sportage


Code 038 means the computer is getting a high voltage return in the heater circuit from the O2 sensor mounted after the catalytic converter. The O2 sensors have an internal heater to make them work as soon as you start the engine.
You would need to test the circuit to and from the sensor to find the real problem.

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My corsa has had the lamba sensors changed front & back, but with no joy the engine management light is still on, could this be a ECU FAULT please help, the scanner is saying its the front lamba sensor...


what exactly does the code say? there are up to ten codes that can be set for any given 02 sensor. there are codes for sensor open circuit, sensor short to ground, heater open or shorted, slow response, lean or rich mix, as well as a couple which are activated by logical algorithms.
what do you mean by front and back? some cars have two sensors on the exhaust near the heads and two more in front and in back of just the catalytic converter. Details are necessary for quality advice

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I have a 2000 Buick Centry and I'm having the same problem after having my mechanic to change my sensor twice, he said that it's an elelectrical problem.

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if you had it diagnosed and fixed all possible problems for it then the the check engine light has to be reset. You can try it manually by turning the key three or four times to the point just b 4 it starts. Then start it up. If that does not work take it to a shop and see if they can check the computer for any other possible problems (i know you can sign up for a pep boys rewards card free and they will check it for you. If all is well ask if they can reset it for you. Good luck.

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1 Answer

Escort has engine light on, diagnostics say 02 sensor is out, both were replaced, same code for 02 sensor bad shows up, replaced again, same code shows up


MOST OF THE TIME AN 02 CODE DOES NOT MEAN REPLACE 02 SENSOR..SOME AUTO PARTS STORES WILL SCAN YOUR CAR..TELL YOU CODE 02 SO PEOPLE AUTOMATICALLY REPLACE SENSORS...IF YOU CLEAR THE CODES DOES THE CHECK ENGINE LIGHT COME BACK ON RIGHT AWAY OR DOES IT TAKE A LITTLE TIME... IF IT TAKES A LITTLE TIME THEN YOU HAVE SOME PROBLEMS THAT ARE CAUSING THE EMMISSIONS TO BE OUT OF RANGE.. IF THE LIGHT COMES BACK ON RIGHT AWAY YOU HAVE A PROBLEM IN WIRING HARNESS BETWEEN THE SENSOR AND ECM....MAIN COMPUTER.....OR SECONDLY POSSIBLE PROB IN THE MAIN COMPUTER...GET SOME OF THOSE ANSWERS AND FIND THE EXACT CODE THAT RETURNS THEN GET BACK WITH ME FOR MORE HELP

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03 impala check engen light stays on and scanner reads, "02 heater sensor malfunction" and i just changed the 02 sensor and reset the light.


vehicle may have more than 1 o2 sensor. have u checked to see if it has more? most vehicles have more than 1

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P0340 CODE COMES UP,SENSOR REPLACED CODE STILL COMING BACK.IF ENGINE IS REVED ABOVE 1500 DASH LIGHT GOES OUT BUT WHEN ENGINE IDLES DASH LIGHT COMES BACK ON.


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