Check Engine Light

Your car has a number of places where leads attach to sensors. Those sensors go to a computer. When one of those sensors goes bad or gives a bad reading, the check engine light appears. It means something is wrong somewhere with your car. They can attach a computer to your car's computer and find out where.

P1491 - Radiator Fan Control Relay Circuit

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.

It could be a few things, most likely you need to change the fuel filter or the spark plugs. It can also be the quality of fuel you put in your car, the cheap stuff rots the tank and sends shards of rust through your engine.

Usually the traction service light can come on because you have momentarily lost traction or if your battery charging system is weak it is one of the first systems you cars computer will shut down as non essential. If you shut your car off and restart a few minutes later it will probably reset itself. If it does not or if it comes on again you should really get it checked out. Your auto parts store will probably read the code for you for free if you don't want to take it to a dealer. good luck

The check engine light error code PO172 means that the system is too rich. The reason why the system is to rich is due to the mass air flow sensor being dirty or faulty.

The check engine light is on when the engine computer has detected a malfunction and set a code. There are pages of possible causes. You need to have the system checked with a scan tool or code reader to have a starting point.

It can be a lot of things, more than likely a cylinder is misfiring, but you will need to have a computer hooked up to it to be sure. It could be something simple like a wire.

A flashing check engine light is due to a condition that is causing catalytic converter damage. Normal cause is a severe misfire

A flashing check engine light is due to a condition that is causing catalytic converter damage. Normal cause is a severe misfire

Have vehicle scanned

this is a fault with the airbag. it is yellow or red right ?
i also have this problem and many people have with a fiat punto

When does it happen? Is it constant? What engine? How loud? how long does it last? Had the same thing in my Ram Truck found it to be the water pump. Possible failed belt tensioner.

That is the check engine light. It means that the engine computer has detected a malfunction. You need to have it checked for codes. You can then diagnose.

You probably have wires that are burning. You should have the vehicle repaired by a professional before you have a breakdown or a fire.

It can be many things. A defective O2 sensor, a vacuum leak, defective catalytic converter just to name a few. Look for a vacuum leak, especially at the PCV hose.

In order to completely answer this question you would need to provide some additional information. Do you know what code(s) were in the system prior to the sensor being replaced? Was it a hego (oxygen) sensor or cat monitor sensor that was replaced. In most cases a hego sensor will not be the culprit. These sensors usually get replaced mistakenly because there is a rich or lean code for that bank (side of engine). A rich condition could be caused by a leaking fuel injector and a lean condition could be caused by a vacuum leak or a stuck closed injector. Hego sensors do go bad. If they fail to read the oxygen content in the exhaust it will through the light on. The other type of sensor failure is in the sensor heater circuit. The sensor has a built in heater that runs on 12 volts. It heats the sensor for proper operation. So again, you would need to provide more info. The dealer would be able to install a computer with software called IDS. They can monitor the fuel trims and perform certain test to determine the problem. Good luck :o)

Certain auto parts stores such as Auto Zone and Advanced Auto Parts will read engine-check light codes as a free service. When I have used this service before, they have given me a hardcopy showing all of the error codes and their associated error messages. Additionally, you can purchase a OBDII Scanner from your local autoparts store (i.e. Autozone, O'Reilly, etc.). These can typically be picked up for around $80.00 and can be used over and over at anytime you need.

Normally you hold down the reset km button for a few seconds whilst turning on the ignition. Hold the button down until it turns off. Or turn the key to the on position without starting the car, pump the gas pedal three times in 7 seconds and watch the light flsh three times, turn the key off and then start the car. That should do it.

I've never heard of an OBDII code that would tell you to change a PCV valve. What code is it?

You will need to have the codes checked for your steering system but most of the time the problem is a bad steering position sensor which is located at the bottom of the steering column on the inside of the car. I have seen defective YAW Rate sensors cause this problem but very very rare.

disconnect your negative battery terminal for about 10 minute then reconnect it. If it comes back on you my need a repair shop to reset it or check to see what is making the light come on

if ou have not fixed the reason that it is on it will not go away. other than that i have reset mine by disconnecting the battery for about a minute

I opened the fuse box under the hood on my 2005 civic and pulled the "ECU" and "Backup Fuses" for 10 seconds and my engine light went away. Or do you mean reseting the "maintenance" light? That is the one that comes on as a reminder to get your car serviced and it doesn't get reset by many mechanics when they do your oil change. For that one you hold the "tripometer" button in, turn the key to the on position, wait 20 seconds, turn the car on, then release the button and the light should be reset.

Have vehicle scanned to see if any codes present

go to most modern parts stores and they will have the tool that they can read the codes in your car and tell you why it's on. it's typically free too. just call ahead to see if they do it.