Check Engine Light

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

If the low tire pressure light come on the dashboard while all of than are the same amount of air; which mean the sensor in the tire is warning you to add some air to the tire because they all low air tire pressure.

It's probably misfiring. You would need to diagnose why.

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.

Misfire

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

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.

In my experience no, But it all comes down to what kind of car you have, All cars are different

The O2 sensor is on its death bed. Get a new one. You'll get better gas mileage.

It may well be that some of the water that was thrown up has gone onto a sensor, causing it to think that something is wrong and therefore triggering the check engine light. If that's the case it should dry off if you leave the car running for a while or drive it around (assuming it's driving without any problems.) Once the sensor dries and it's happy there isn't a fault, the light should go off. If it doesn't, or the car shows any other symptoms you're concerned with, take it to an expert.

Trouble code P0404 means:Exhaust gas recirculation circuit range/performance

I had all sensors replaced in my 03 Trailblazer and the check engine light stiil comes on. Why?

The light is on because there is a problem with the vehicle. Until the problem is fixed the light will remain on. Have your local auto parts store plug in a diagnostic code reader to determine what the problem may be.

disconnect battery for 5 min then hook back up codes erased light will be off

90-9879

The check engine light 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.

"service vehicle soon" pertains to issues with electrical systems such as lighting, Radio and traction control/Anti-lock brakes. Check your relay's under the hood on the driver side behind the strut tower.

leak detection pump solenoid, part of your emissions, check for leaks in your hose or a break in a while around the pump

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.

No, a 1994 Dodge Van is OBD I. It uses a different scan tool and connector.

A flashing check engine light frequently means that the engine has a cylinder miss firing, the jerking you are feeling is a misfire, you probably just need to get a tune up, which means basically change spark plus and wires, and flush and change all fluids.

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.

It could

If you don't fix the problem that is causing the check engine light to come on you can unplug the battery a thousand times and the light will continue to come back on. Have the codes pulled and find out why it's turning it on in the first place.

oil filter might be clogged or your oil sending unit might be weak

Into the diagnostic connector under the dash on the driver side.