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.
Have electronic vehicle speed sensor in transmission checked out. It will cause loss of speedometer function and set a fault code(check engine light).
Defective computer these vans are known for this
Check to see if the cooling fan ( if so equipped) comes on when the a/c is turned on. It should come on when either the a/c is on or the defroster is on. (both activate the a/c compressor).
why do check engine light comes on
Not that I know of. The oil pressure light comes on at a very low pressure, but it will not shut the car off.
The check gauges light comes on when one of the guages is out side of the safe zone. It could be battery voltage, oil pressure, engine temp....
The first step is to have the codes checked with a scan tool. That will give you a starting point as to what the failing part could be.
1995 and before comes out the top. 1996 and later come out the bottom.
No, the check engine light comes on when the computer detects a malfunction and sets a code.No, the check engine light comes on when the computer detects a malfunction and sets a code.
Check the crankshaft sensor. The sensor connector could be loose or the sensor could be bad. Try to read the engine codes to see if the computer shows an issue.
The check engine light comes on at start up for a bulb check. If it stays on with the engine running the computer has detected a malfunction. You need to have it checked for codes.
Check the engine oil, sometimes when the oil is low the check engine light comes on while sitting still and goes out when you accelarate.