Check Engine Light

This happened to my 16 year old daughter's car and it was because the gas cap was not on tightly and eventually found out it was faulty.

Propably needs a tune up. Plugs & wires. This vehicle is 11 years old.

If the check engine light is turning on, the computer has detected a fault and has a code for you to read. The code will tell you what the computer has detected. You can borrow, rent or buy a code scanner at most auto parts retailers. One common scenario is that the engine is given a little more fuel while it's warming up. During that time the throttle body is opened a little extra to allow for a slightly higher idle speed, and the EGR valve is closed or nearly closd. After the engine is warmed, everything goes back to "normal", the amount of fuel is reduced to a more fuel conserving level and a small amount of exhaust gas is recycled into the intake to keep the valves from burning from that lower fuel level. If the EGR valve is plugged or is not functioning properly, the engine will have difficulty idling after the engine warms up. You should be able to verify that through a diagnostic code.

According to the manual it means engine failure sensed in the Electronic Control Unit or a fault in the ECU. This is coming up on my car also but I dont know why. The idle revs on my car when not used for a few hours are also running low and it cuts out. I must drive it first for a couple of minutes for it to stablise. I found a forum called www.pug206.net which seems to be quite handy for hints and tips. best of luck.

I also had this on my 306 (y-reg), first time, just took it to my local garage and they reset the ecu. It came back about 6 months later, it was linking back to the sensors in the ecu, I had to get this reconditioned for about £300.

It is an essential function of the eye that helps spread tears across and remove irritants from the surface of the cornea and conjunctiva. So we would probably go blind if we don't blink.

No.

The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to a parts store or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.

It was sold "AS IS" for a reason... The problem becomes yours when you purchase "AS IS". Sure this is not what you wanted to hear... However, I am not a lawyer.

The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.

Yes it will reset after a set amount of driving cycles if that repaired the problem. Or you can remove the negative battery cable for 5 minutes to reset the light.

Auto manufacturers go to a lot of trouble to make sure people don't try to fraudulently roll back odometer miles to make a car look less "worn out" than it really is. There is no easy way to roll back an odometer other than to just replace it.

oxygen sensor ( in the exhaust , the sensors closest to the engine are used to

" sense " the amount of oxygen in the exhaust to send a signal to the PCM

so the air / fuel mixture for the engine is adjusted under various conditions )

There could be several reasons for the check engine light to come on. You can take it to Advance Auto Parts or Autozone and if the check engine light is on they will hook it to their computer and tell you exactly what the problem is for free.

Two ways the Check Engine Light (CEL) can be reset: (1) use an OBDII scanner to reset it, or (2) disconnect the NEGATIVE battery cable for about three minutes , then re-connect. The latter will make the engine run rough for a few miles because you will also be erasing information stored in the computer that applies to performance. After a few miles, the computer will "re-learn" and everything will be back to normal. If the CEL comes on again, you definitely need to take the vehicle to Auto Zone or another place that will scan the codes stored in the computer and give you the diagnosis of what's causing the CEL to come on.

Trouble code P1698 means: No CCD Messages Received From The TCM

Have the cam belt replaced. Ignore this and you may end up with a broken cam belt and serious engine damage. 96 and newer check engine lights are not set by mileage intervals. 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

Disconnecting the Battery (and Reconnecting it of course) will get the light to go out. Assuming you have fixed the problem, it should not come back on. I do not know if this will "reset" it, though. It may still give you the code for the problem you just fixed instead of a new code if a different problem comes up, but I doubt it.

Sources of owners manual are Dealer, Salvage Yard, Ebay, and many on-line sites. Check Engine light will come on when the computer has detected a fault in the emissions system. Scanning the computer will list a fault code that will help to narrow down the problem. EST is, Electronic Spark Timing. I have a 97' Chevy Cavalier, and my check engine light comes on every once and a while. When it does come on the ETS OFF light also comes on...did you mean the ETS OFF light? or the EST OFF light? ETS OFF means the Enhanced Traction System. I took my car to Autozone and had them read the computer and it had something to do with a misfiring sparkplug, I replaced the sparkplugs and now everything is fine.

yes its because a bad ac pump may be locking their for creating more stress on the engine, mainly on idle the engine might try to turn off or run rough their for creating a check engine light low engine power. or cylinder miss fire..............EXCUSE ME but i feel the vehicle owners should be informed.... Iam new to this site but am i the only tech. in this house? I love learning things and iam praying the other subjectcs of my intersst were NOT the same type ive found here.I do not wear a cape, but ive had to re on EVERY AUTO QUESTION i came across...... I would like to elaborate on your question,when you say bad do you meen inop ? iis it cycling,does it click off and on ? bad is a very tough word for a technician.the a/c compressor,if it did seize up your belt would would squeel or seize up.but as the norm,unless you own a dodge p.u. the check engine light could be anything that has to do with the pcm,or ecm.

left exauhst pipe behind the Catalitic converter

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.

I already know the reason is a tranny issue causing the warning light but it still runs and drives great at this time. I only want to reset the light until the trans is actually bad enough to need the $2500 repair.

When the service engine soon light comes on it means the computer has found a problem, it should post a code in the computer memory.

Plug a scanner into the port and it should give you the code. From that you can look up what the code means and that will give you some idea of what the problem may be.

It's the " service engine soon " light to the left of the gas gauge instead of the " check engine " light , like it is on my 1995 Ford Explorer

what car is it on... year make model... engine size/ auto or manual trans.

That's a VW only code-idle speed control low input- problem with tps on throttle body most likely. R&R.