Car with check engine light on. Diagnosis cat not up to par. replaced cat and ox sensor. check engine light back on. Now running rough at idle. Diagnosis now is egr valve, noticed low vacume. Any thaughts?
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Which solenoid was replaced? Why wasn't the correct oil in there the first time? Secondary O2 sensors only monitor cat. Converter efficiency. NGK uranium sounds fancy and I'm sure the parts guy thought so too but is that recommended by GM? What was the check engine light on prior to all of this? If you had a p0420 suspect a melted cat. Converter. Fire it up and hit cat with hammer. Might fix it but that check engine light will be right back. Easy diagnosis though
it is the o2 sensor in front of the cat converter jack up truck and support under truck locate ur cat converter do this with truck cold cat can burn skin very easily same with exhaust pipes .when locate converter follow pipe forward towards engine look toward top of exhaust pipe will see a small tube with wire connected this is problem sensor check wiring and connector un plug and remove replace than reconnect
Have you had the battery changed since you had the car. Have that checked for a full charge and no dead cells. Always have the air-conditioning completely off when starting the car. The starter takes a lot of amps to turn over and having the AC on doesn't help.
and another reason is the code didn't clear out completely. this tool can help you test the code.
You need to read the codes that your check engine light is showing. Go to Autozone or any place like that and they can read the codes for free. Throwing parts at a car doesn't fix it but finding the source of the problem and then repairing as necessary will allow for better results. Going off the check engine light being on can mean it is anything.
You have two O2 sensors on your car. One just after the head on the header. This is the O2 sensor that tells the PCM what the air/fuel is and the PCM can adjust accordingly. The one BEHIND the catalytic converter (or cat for short) does nothing but tell the PCM that the cat. is working properly. You may be changing the wrong O2 sensor. Also the EGR could be an electrical problem if that is the cause of the emissions failure.
So to review, find out the codes, post back with the codes and everything can go from there.
The wiring to the sensor or the connection plug is burnt as the wiring gets close to the exhaust manifold and down pipe. Sensor 1 Bank 2 should be the right rear sensor or the back side of the engine after the cat.
Check your wiring at the sensor plug and retrace back up to the the main harness to find a burnt spot or a break in the wire at a tie off to the frame. Next the vacuum leak may be a bad gas cap. Check to be sure it is on right, ck for any hoses that may have be loosened during the replacement of the Ox sensors.
The check engine light is probably indicating a catalytic converter malfunction the Oxygen sensor that is located after the cat tells the computer if the cat is functioning properly it is possible the wire has been broken or damaged. To see if the cat is there jack up the car and look under the passenger and driver area of the car follow the exhaust pipe from the front back the first thing the pipe comes to should be the cat it looks like a muffler with a wire going to a sensor after toward the back side of it, I doubt they never installed one but I guess it is possible.
sorry dealer only ,this information is not published ,go to dealer and lay the golden egg ----owing to complexity of the anti-theft systems and not allowing this information for general use to stop car theft ??well thats the excuse anyway .do you know a good solicitor who can sue them under the freedom of information act you have stateside .because in europe the problem is acute with no re -address.. .software encrypted so if you try to read it it just show anything with a general mechanics reader .are you preparing the golden egg ??ready for the dealer ??my advice if it runs ok leave well alone and throw you scan master or digisoft reader in the bin as it will not work on modern cars and the newer the car the less you can do with it.