Check Engine Light

Engine coolant temp running 220 degree F

Faulty: spark plug, spark plug wire, ignition coil, ignition module, fuel injector are the most common. Coolant leaking into a cylinder is another.

Internal engine problems such as burnt valve, broken valve spring, bent push rod, worn rings

It would be very rare for a P1684 code to turn the light on.

Check the coolant level in the radiator when it is cold.

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**Actually the check coolant light indicates the reserve is low. When facing the engine with the hood up...look to your left and you should see the tank. Fill that to the fill line and then run the car until the thermostat starts to pull the coolant...add when it gets low and until it stops taking fluid. Do not add directly into the radiator unless the reserve tank is empty.

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. It is emission related. If you are unable to do this, take it to an independent repair shop and have them do it for you. We just called our mechanic yesterday about the same problem. He said that since he had just installed a new belt, the problem might be that we didn't screw the gas cap on tightly. After fixing the problem it could take 200 miles before the light goes off.

on mine i just changed the o2 sensor located in the front by fan

Generally, the CEL (check engine light) is generated by an emissions related error.

Many auto parts places can "code" your car to tell you what you need to fix.

Fix the problem, the light should go out.

Other than that, you could have the code cleared via above or by disconnecting the battery, but it will probably return if you don't fix what was wrong in the first place

Connect an OBD-II code reader to the port just above the driver side kick panel and use it to reset the truck's computer. These readers are available online for less than the cost of a tank of gas. In the US, AutoZone will loan this tool free of charge (with a credit card) and the light can be reset in the parking lot.

dealer must clear

Many of the OBD2 diagnostic scan tools allow you to clear the codes. You can borrow, rent or buy an OBD2 code scanner at most auto parts retailers.

However... once a problem has been properly corrected, most codes will clear themselves after the engine has "cycled" a few times. A 2007 Tahoe does not use OBD2, it uses CAN for communications. A scan tool must be CAN equiped to clear DTC's. Also, it may take up to sixty drive cycles before the VCM turns off the SES, so it will take awhile.

Of course not, the problem must be fixed.

you can temporarily clear the light by disconnecting the negative battery for a minute, or using a code scanner, but if you havent fixed the cause it will come back on.

Many reasons! Go to the Dealer or Auto Zone (free) and have your problem codes read from the computer in the car.

There is a technical service bulletin for this code. This concern may be attributed to water that may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump. Replace the AIR pump and install a new inlet hose and solenoid tube assembly.

There are pages and pages and items that can cause a check engine light. You need to have it checked for codes with a scan tool. After repair light can be shut off with scan tool.

I do not have the exact URL for the page, but I know I have seen them posted on

allpar dot com (huge site, nothing but Dodge/Chrysler vehicles,repairs,info, etc. with a specific section on minivans.

You might already know this , but I post it anyway. To see the codes displayed, You insert key, turn on to accessories (not start engine), turn off, turn on, turn off, then turn to on again and left it in that position.

In a few seconds, you will see a cycle of "blinks" begin on the dash display, (left side of steering column in my 90' Grand Caravan). The code format is displayed in pairs.

Example: one blink, short pause, three blinks = Code 13

longer pause

Example: two blinks, short pause, five blinks = Code 25

End of cycle is always displayed last as five blinks, short pause, five blinks

I guess this code display is on many cars other that Chrysler/Dodge (Fords)

Sure, go ahead. New engines aren't all that expensive.

If your knock sensor is giving a true reading, you are probably using a fuel that does not meet the octane requirement of your engine. Could you possibly have filled up with 85% ethanol? If you continue running the engine while it is knocking, you will damage the pistons and experience run-on or dieseling. If your knock sensor is giving a false reading, you won't experience engine damage but you will get lousy gas mileage because the computer will try to retard your timing and change the fuel/air mix. Get it fixed. It is cheap.

You may have a faulty engine light. Or, you may have a serious problem with your car. You should take your car to a local mechanic for diagnostics.

To remove "insp" service reminder message on Vauxhall Agila May 2008 onwards; 1. With ignition off press and hold both clock and trip reset buttons. 2. Turn ignition on (Keep both buttons pressed) (No need to start the car) 3.Wait for "insp" message to flash three times and change to three dashes 4. release both buttons and turn off ignition 5. Job Done ! Now just turn ignition on again to make sure it worked Hope this is of use worked first time for me.

Most auto part stores can scan and determine problem

You have to leave a $200 deposit though, if you know the guy and he's pretty cool he'll go outside with you to help you plug it in so you don't have to go through all that hassle

Take your car to Autozone and have them hook their scanner to your scanner port. The scanner will display the code for the problem causing the light to come on. It will also tell you the area of your engine that is tripping the code to come on. Autozone does this service for free at most stores. It means the computer has detected a problem with the emissions system. A scan of the computer with an OBD2 scan tool will bring up a fault code stored by the computer. This code will tell you what part is being effected by the problem. It will not necessarily tell you the part that is defective, but rather what is being effected. To determine what is actually wrong requires the skill and knowledge of a professional. Unless you have this skill and knowledge, pay a professional to fix the problem and do not just throw parts at it.

It could be the temperature sensor you would have to see what code is tripping.

The answer is on page 11 in the owner's manual ( "Light is blinking" ). Engine is misfiring, bring it to a garage as soon as possible.

Bring it to a shop or an auto parts store where they can hook up an OBD II scanner and read the trouble codes. Turn the light off by either fixing the problems the codes tell you, or have the person reading the codes turn off the indicator light using the scanner.

If you are referring to the Check Engine light, then it is on because the ECU has detected a problem with the emissions system. Have the ECU scanned to retrieve the code that has been set. This code will tell you what part or system is being effected. Not necessarily the defective part.