Check Engine Light

First off you should take it to a GM or qualified mechanic with a computer to hook up to your ALDL connector to read the codes to see if what the problem is.

Secondly you must remember that there is a billion things that could set that code off.

The first of many I would check is

EGR valve - very common and what happens here is that your truck will run like a John Deere tractor and stall and the brakes go limp and of course suck a 1/4 tank of gas in about 30 mins, just driving down the steet etc. To fix this clean your pintle valve out and clear all carbon from the valve itself, then clean the throttle body. Now listen carefully... this will happen again and again if you do not replace your EGR valve gasket with a clean screen from www.tomco-inc.com Yours would be GM Linear EGR Gasket Tomco Part #2-1357.

The very next thing I would check is the O2 sensor - go with the bosch but remember if its a 1993-94 then you only need one. 1995 or better you have two which are really difficult to get at.

to clear the codes if all is well is simply remove your negative ground for about 10 mins and then connect and start the engine. If you code is still there you are going to have to pay for the test which is around 45-50$ (CND)

beware that not all places can get into the ALDL terminal and GM might just be the best place to start as they made these money sucking pigs of a truck in the first place.

Good luck and let me know how you make out as I have some more resources you can use.

Cheers SCott

Go to a independent garage. 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 test the computer runs the car through, if a problem occurs, it may not run all of the self tests until that problem is taken care. Therefore, another problem may exist.

Remember that you can reset the check engine light by simply disconnecting the battery, however, this will only last for around 100-150 miles if ther is something wrong with your vehicle. If there is still a problem, it will come on again usually within that period of mileage.

If you are in a state requiring emissions, then don't bother doing it unless you know for sure it will stay off before taking it in and you have at least that amount of mileage on it. By resetting the computer, you lose all data (codes) and it will show up on the machine in the emissions place, therefore wasting $25 (or whatever they charge where you're at)

The Check Engine Soon Light is a sign something is wrong with your vehicle. Rarely does it indicate something wrong with the light itself, but that has also been known to happen. Whatever you do, do not ignore it because before you know it, the vehicle may not run.

Make sure your Truck is in good maintenance. New plugs, air filter, fuel filter etc. Then check engine codes. Also may want to check coil packs, injectors and give a compression test.

Replaced the upstream O2 sensor on a 1999 Ford Ranger 3.0 flexfuel and the check engine light went off and came back on after driving approx. 4 miles. Read code and it showed p0153 just as it did before. Is there a certain amount of time that the vehicle has to be driven before the computer will recognize that the new sensor is OK?

A malfunction with the supplemental restraint system ( air bags ) has been detected

It could.

Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1)

symptoms
Other than the MIL light illuminating you may not notice any performance issues.

cause
A short in the O2 sensor heater circuit or the sensor itself
A faulty O2 sensor heater
Wiring or connectors are broken or frayed to the sensor or relay
Bad PCM or ECM

The fix
Correct wiring short or loose connector found in inspection.
and/or
Replace the bank 1 sensor 1 O2 sensor

All 1996 and newer vehicles are OBDII compliant so your trouble codes will need to be read with an OBDII code scanner connected to the port under the dash on the drivers side.

tighten or replace your cap

If the check engine light is flashing as you are driving it means you are about to destroy the catalytic converter(s). Stop the engine and get it to a garage.

adverb A+

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.

Faulty wiring.

Bad plug or plug wire. A vacuum leak may also be a possibility. You may also have a burnt valve or blown head gasket. Check the compression on all cylinders to see.

COMPRESION FINE,REPLACED PLUGS, & IGNITION COIL & STILL HAVE A MISS FIRE IN #4 ONLY??

Have vehicle scanned at auto parts to determine problem or clear codes Take off the P{lus side of the battery,that will reset it.

No it will not.

Because there's an intermittent issue which needs to be addressed. You need to have the DTCs (fault codes) read to find out which codes you have, what your active codes are, what your inactive codes are, and how many counts of each fault you have.

Check to see if your gas cap is tight.

The easiest way to reset the check engine light on a 2003 Jaguar XJ, is to remove the fuse. Keep the fuse out for 10 seconds and then put it back in. If the engine light remains on you should see a mechanic.

Have vehicle scanned to determine the problem (usually in the emission control system) and have codes cleared

Both of my late model vehicles do this; the fuel injected vehicles have a variation of a idle speed motor/ idle speed control valve/ many different names. What they do is adjust the idle. Many times they can cause a slight lean condition which manifests itself as a slight rough idle. I would not worry about it and don't throw dollar bills at it.

The P0440 code is for an EVAP system leak. This code sets when the vehicle's computer detects that the EVAP system cannot seal itself after running the onboard diagnostic test that it runs at random times once enable criteria has been satisfied. The problem could be something as simple as a loose gas cap or an inoperatve purge or vent solenoid or as complex as a wiring issue or as expensive as a powertrain control module (PCM) the vehicle's computer. Always perform a visual inspection of the EVAP system prior to replacing any parts, because guessing can get to be very expensive rather quickly. As I mentioned make sure the gas cap is adequately tightened and if you are somewhat mechanically knowledgeable follow all of the lines coming off the fuel tank to where they end paying close attention to good connections or any physical damage such as a crack, split or broken line.

The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle.

Generally, a check engine light is lit when there is a problem in the emissions or somthing that is affecting the effectiveness of the emissions.

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.

This light could indicate many things. It is usually still safe to keep driving for a while but you should book an appointment with a technician that can determine what set off the light.

Only4 - 2 front(before catalyst bank1,2),2 rear (after catalyst bank1,2)