replaced both sensors,catalytic convertor,spark plugs, and my check engine light will not stay off?

Answer 1

(Check Engine Light)
There are many components that work together in the engine to maintain optimal engine performance and economy.
A service engine soon, or check engine light indicates that there is a sensor that is reading a condition that is "out of range".
Simply resetting the light does not solve the initial cause of the problem.
Replacing a number of parts trying to troubleshoot the problem in the hopes of getting the light to stay off is a tremendous waste of time and money.
The simplest, and most economical way to alleviate your issue, is to have an engine diagnostic done by a reputable shop to determine what caused the computer to signal you to begin with. Just reading the computer codes may not find the "cause".
That being said, if per-chance you feel the need to reset the light in the hopes that it was a "glitch" of some kind, you could disconnect the negative battery terminal for a couple of minutes to clear the check engine light.

Answer 2

Service engine lights 90% of the time (exclusively in some vehicles) are set off by emissions problems. Generally, if you have an SES light on, you have an emissions problem. Get the trouble code read, and you can find out what the problem is. Googling your trouble code will show you hundreds of people who have had the same issue. The most common culprits are sensors, o2, mass air flow, coolant temperature, Emissions Gasoline Recycling etc. However, if your EGR (for example) is shooting a trouble code, don't just jump to replacing the sensor. Instead, look for the root of the problem, inspect the whole system. There are tiny passageways in and around your upper intake manifold that will clog up with engine gunk, and simply finding them and cleaning them out is a common solution for this particular trouble code (in this case it is usually p0400 or p0401). Just get the code read, then re-post the issue with more info, and you'll likely get a whole slew of people who have had the same problem. SES lights are very very common, and if you live in a county where emissions tests are required, you won't be able to renew your lisence plate until you get it addressed.

Answer 3

If these parts were not the cause the light coming on in the first place, it doesn't mean you would not have had to soon replace them anyway. (Depending on their condition) If these were identified by your "on board computer" codes as the culprits, you just need to reset the light by disconnecting a fuse. You can disconnect the battery, but then you'll have to reset your clock and stereo settings (No big deal). This will reset your computer. If it comes back on again, check the codes. If you don't know how, find out! Otherwise, you are going to be at the mercy of a high priced shop that will make what you've already spent look like peanuts!

Answer 4

Are you just throwing random parts at this problem hoping to maybe get lucky and make it go away or have you had the actual problem diagnosed by a competent automotive diagnostician with the proper tools and equipment?

If is the former than no one can help you. If its the latter then I suggest you switch mechanics.

Check engine lights don't usually go away on there own by the way (for some codes they do but not most). You have to fix the problem that triggered the light to come on then clear the codes out of memory to reset the light.

ASE Certified Automotive Service Advisor

Answer 5

Depending on what year, make or model car you have, there could be many more sensors that have been overlooked.
Even if are lucky enough to have found the right one, you still have to cancel the memory in the computor to clear the history.
Also, on many models the gas cap not sealing right can cause the problem.

Answer 6

Quit replacing good parts, and put it on a computer to find out what the problem really is.

If a computer told you to replace those parts, unhook your positive battery cable for about 10 minutes to reset the computer. That should reset the light. If it comes back on, you have more problems.

Answer 7

most check engin lights monatar the internal presurs of the motar and the other things the best way to turn it out is to un hook your negative battary cable for a few min the hook it back up and start the car if it stays on then take it to a auto zone and they can hook up to it and tell you what is causing it and maby turn it off( if your car is newer then a 94)

Answer 8

Take it to a shop. That will be a lot cheaper in the end than you replacing a bunch of parts hoping to fix the problem.

Answer 9

I can only say that you should get the vehicles computer scanned and check for any problems as well as codes and then you will have a good idea on what the problem truly is.

Answer 10

Go have a Diagnostic Test done, that can tell you exactly whats wrong, ita can be something as simple as a sensor, or a bad fuse.