Check Engine Light

The fastest way for my 96 T-Bird is to disconnect my battery for about 1 minute. HOWEVER, if there truly is a problem, you should expect the light to come back on soon. I had the light come on when I had not driven the car for a couple of weeks. Then engine ran rough for the first couple of minutes and the light came on. I disconnected the battery and that solved it. First you need to find the code in the computer that is causing it to be on The simplest thing is to check the aircleaner, a fairly clean air cleaner caused the check engine light to stay lit, when it was replaced the light worked as it is supposed to. Pull the codes from the computer, match the code to the troubleshooting procedure, follow the procedure to find the source. Repair the source, light will go out if that was the only problem. There are "monitors" or self tests the computer runs the car through a drive cycle, if a problem occurs, it may not run all of the self tests until that problem is taken care. Therefore, another problem may exist. It is emission related. OR hook up a scanner that is capable of clearing codes, and hope that none are still active. The " check engine light" is by far one of the most misunderstood technological advances by the public. I am sure I will revise this as time goes on, as it is an in-depth understanding for the public. It is a warning light that is illuminated when there is a problem with the EMISSION SYSTEM only. Emission system being the pollution control system. Don't get a hard on against it as it is a good thing once you understand it. One point that was brought up a a recent meeting of technicians was that the amount of hydrocarbons is greater when the gas cap is left off than when the engine is running. Hydrocarbons are part of pollution emitted as gasoline evaporates. Going a step farther, one facet of the emission system is the "Evaporative" portion. This is when the fumes from the gasoline are leaking from the system into the outside air. This is one part of the emission system that can trigger a check engine light. I would say that about 7% of the vehicles that have a check engine light are the result of a loose or inadequate gas cap. But understand that many scenarios are possible with the "check engine light" The vehicle's powertrain computer (note that some vehicles have 17 different computers) will run a series of self-tests. They will only run under certain criteria. And they can be vastly different from manufacturer to manufacturer. Some self-tests are not run until preceding ones have run successfully. So if there is a problem in one particular area that is preventing another self test from running, you can have a situation where one problem is fixed, but another still exists. If you fix a problem and drive the car through a drive cycle that sets the monitor (or self test) the light will go off as it passes that criteria that triggered it in the first place. After 1996, the auto industry went to a idea called OBD II (on board diagnostics). This was to get all the manufacturers onto a similar plane for troubleshooting and powertrain control. While they still differ vastly, many corrections and adaptations were made for technicians to better fix the check engine light problems. Prior to this there were so many different and poor troubleshooting data from a check engine light problem that resolving the problem was much more difficult. Many early warning light of this nature were set to illuminate based on mileage. An Oxygen sensor was one of the things that were meant to be replaced when that mileage was hit. This is much like many current "Change oil lights? that are set based on a pre-set mileage. Actually the fastest way is to disconect the negative side of battery. Then turn the key in the ignition like you were starting the car. Do this for 10 to 15 sec. This will resest the computer. If light keeps coming on go to an autozone or checker and the will check the codes for free.

If the vehicle is 1996 or newer, then it uses a OBDII computer system for onboard monitoring functions. The check engine light can be turned off by using the "clear" function of a scan tool (which can be rented at Auto-Zone or be done at the dealership).

P0440 OBDII code is for evaporative emissions control system failure.. check your gas cap though, many times a loose gas cap is the culprit with this code, hope this helps some1 out.

There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.

12 means that the battery was disconnected within the last 50 cycles of the ignition.(nothing to worry about) 43 is the code for a short in the ignition coil circuit 55 means that there is no more codes stored in the computer (END

1996 and later Explorers use an electronic speedometer which is operated by a vehicle speed sensor (VSS) The powertrain control module also uses the vehicle speed sensor input signal for several different engine and transmission control functions.

I have a 95 Tracker as well and recently it turned 100,000 miles. At 100,001 the "check engine light" came on. A local mechanic did a diagnostic and it also didn't give any codes to help reset the light or alert me of a problem. I asked him about the reset "switch" under the dash and he said he never heard of that. I investigated on my own when I got home, because the light being on was driving me crazy, and there actually is a small switch that reset the light. I removed the small plastic panel under the steering column and found it between the drivers side speaker and the steering column. It is really small. It is a black plastic switch with a metal face plate. You really have to look for it because it's settled in with the wire harness' under the dash. I flipped the switch and the light went out. Again be patient when looking for the switch. It's there you just have to look close to the dash and next to the steering column. I tried removing the battery cables because I read that that would reset the light but had no luck doing it no matter how long I left them off.

If your check engine light has come on, that means the cars computer a detected something wrong. If everything seems to be in order, take it to an auto parts store "Auto Zone", and the will hook up an OBDII scanner "On Board Diagnostics system" and that will give them a code and they can look up that code and tell you what has set the check engine light off and then they can clear the code.

You have to have a "code reader" to first read the trouble code and then to reset the trouble code in the vehicle's on board computer system. The "code reader" is available from most auto parts stores and will work on most newer vehicles.

Basically if the check engine light goes off it means the fault is not permanent and not consistent. The fault came and after so many cycles the PCM said there's a problem and it lit up the check engine lite. After so many cycles of the fault correcting itself the PCM then stopped the light from being on. Nevertheless the PCM always usually records this fault in its history of faults for retrieval later on via a scanner

== I have heard that sometimes if the gas cap is not on tightly, or the door to the gas cap is not completely closed, that the check engine light may come on. Perhaps it settles after a few days after going over a few bumps.

If you are checking a Chrysler/Dodge 55 is "end of message". It just means that there are no more codes to show. If that is the only code you got , then there are no codes.

Trouble code P0420 means:Catalyst system efficiency below threshold

If the check engine light stays on , a malfunction with the emission control system has been detected , have your Ranger scanned for any trouble codes to diagnose and then repair the malfunction

Pushing the "OFF" button, and the "WARM" buttons TOGETHER, will read the codes. Pushing the "OFF" and "HI" buttons TOGETHER to clear codes. Assumingthe cause of the light initially to come on, was corrected, the light should go off. Good luck

Disconnect the negative battery cable for a couple of minutes, then reconnect. This will clear the error codes from the computer. If everything is okay, the light will stay off.

It's probably in the "clock spring" in the steering column. I just had mine replaced. The airbag light was flshing 3 then 2....It's not cheap and you really need a professional to do it.

get the engine serviced.

Closed fuel control insufficient coolant temp. Check out this site.

My advice it to have this done at a muffler shop.

evaporator emission system pressure senser

this is normally caused by water entering the electronics of the engine. The most poular is the distributer cap. open cap and allow to completely dry and reasemble and see if that solves the problem.

That is the check engine light. It will come on and stay on when the computer has detected a problem with the emissions system on the vehicle.

I have a daewoo matiz that has low power when the engine light comes on I have changed the spark plugs/leads/distributer cap/distributer/and coil checked the timing changed the fuel filter air filter and it still looses power when the engine light comes on.

You have spent a lot of money and you still have the problem. Do you not think it might be time to take it to an expert and have it repaired correctly. You would've been money ahead right at this moment.

If the VSC flashing light comes on at the same time on your Toyota Corolla, then there might be a sensor issue, and if you have a warranty, have it back to the manufacturer.