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.
yes
Did you try unhooking the battery
It is the one next to the service light.....second to the right.
With an OBD2 code reader
A check engine light displaying on a Volvo V40 means maintenance is needed on the car. Check the car's instruction manuals to see each mileage checkup recommended by the manufacturer.Ê
disconnect the battery for 1min or so the light will go off
the oxygen sensor(sensors)
With an OBD2 code reader
how do you reset engine light on 1991 volvo 240
On the bottom right side of the instrument panel on the dash, next to the "Service" light.
if your car is still running fine it usually an o2 senser
Check your gas cap. I had a 2402 on my S40 and the gas cap was bad, easy fix...