Check Engine Light

The engine computer had detected something wrong somewhere in the engine management system. This could be an O2 sensor or any number of things. Take your car to a shop and have your car scanned for fault codes to see what the problem might be.

Hi, I just wanted to add more information on this problem. The truck will not start, and the check engine light is on. I tried to use a scan tool, and it did not find any fault codes, but the light is still on. This problem cane after I changed the MAF, MAP, TPS, EGR and the fuel pump. I have reinstalled the old components, except the fuel pump. I checked to see if I am getting spark and fuel pressure. The spark seems weak, and I have no fuel pressure. I read in the manual the the oil pressure switch can cause a fault that shuts off the fuel pump, but not sure how to verify that. I checked the fuel pump relay and it appears to be OK, and there I think there is power to the relay, since there are 3 relays side by side, I don't know which on is for the fuel pump. Any ideas would be appreciated. Thanks. I have tracked down one problem to the fuel pump, no I lose ignition power after a second or two. Any ideas? Thanks.

You can disconnect battery or pull the ECU fuse which is in the fusebox. The fuse will say either ECU or EFI (elec fuel injection) Pull the fuse and let it sit about 2 minutes, this will cause a reset, then plug the fuse back in or reconnect battery and that should do it. I got sick of the Check Engine Light so I pulled the instrument cluster, disabled the light permanently, and re-installed the cluster. I hate to spend money for maintaining emission controls since they don't test in Kansas. If I sell the car, I will just re-install the bulb for the engine light

make repairs and verify the fix with your consult-I diagnostic tool also the infiniti I-30's had an issue where the check engine light will stick on because moisture gets into the sensor some how so go to your local auto zone and they will reset it for you at no charge and also let you know if there are any codes showing.

It means that the traction control system is disabled. You may have manually switched it off, or the parking brake may not be fully released, or there is a fault detected in the system and a scan tool will be required to learn what fault has been detected.

It's OBDII. You can either use a codereader to check and clear the codes, or remove your negative battery terminal for 10-15 minutes. Chances are there's a problem, it would be best to have the codes checked and the problem resolved or the light will come back.

you do not remove the negative you remove the positive batery cable

Yes

Something might be wrong. Have the code read to see the problem.

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.

If you turn on the ignition without starting the engine and the Check Engine light does not come on, the bulb has burnt our or has been removed. Replace the bulb.

The check engine light is on because the engine control module (ECM) senses a problem with the system. Resetting the check engine light without making repairs will only set the light back on again. Drive to your local auto parts store and have them read the codes that are set and with that information they can help you determine what needs to be done to cancel the check engine light. It would help to also list the year, make and model vehicle you have for us to help you.

It would be different with fuel injected vs carbureted vehicles but same principle. Usually there is a lack of fuel and too much air that causes a stall on accel. It could be traced back to a weak fuel pump or restricted fuel filter, or both (lack of fuel volume). But I think, in the real world, the most common would be a bad accelerator pump on carbs and a faulty tps on fuel injected. There is also a possibility of a bad map or maf sensor, but less likely.

Disconnect the battery for 15imutes

You need an OBD tester to show what the problem is and to turn the light off. I believe you can lift the battery ground for a few seconds to turn the light off,but it will probably come back on.

no

It means there is a problem with the AWD system or regular scheduled maintenance is required. Your owners manual will list any scheduled service it may need. If you see no service is needed then you have a problem. Seek professional help.

It means there is a serious problem that must be repaired immediately.

That depends, each vehicle takes a different amount of time to do all the required self tests.

check for an emmission control system problem such as the heated cannister purge valve

you're better off replacing the knock sensor . it adjusts the timing automaticly by sencing any knocking sound & does the needed adjustment .

Service soon reminds that the next periodic service is coming due. The engine light indicates that the engine management system has detected a fault which effects efficiency/safety and should be investigated

The MIL or malfunction indicator light is telling you that you have a problem with your engine operation or efficiency.

You will need to have the codes read with an OBDII code reader at a garage or auto parts store and repair whatever it indicates the problem is.

The same tool can clear the codes as well as pulling the ecm fuse or disconnecting the battery for 30 seconds but the light will not stay out until the problem is addressed.

Also clearing the codes without making the repairs will not get you to pass emissions as the system will need to go through a series of system checks before an emissions station can check it, a 2003 vehicle needs to have 6 of 7 tests complete for an emissions test to go through and it may take several days of driving to accomplish this. By that time whatever triggered the mil will show up again.

Unplug the ecu . . . which, when looking into the engine, should be on the leftside firewall. Single bolt holding the plug into it.

P0171 - system too lean ( Bank 1 ) - passenger side of engine P0174 - system too lean ( Bank 2 ) - drivers side of engine

Trouble code P0404 means: EGR Position Sensor Signal Performance