Question about 2006 Volvo S40

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Engine light on

On the dash board the engine light is always on

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This dashboard light on modern cars sometimes fills people with dread. In reality it is your friend as a car owner, and one of the best advances ever to appear on cars. The ECM computer which runs your engine has many sensors connected to it which tell the ECM about conditions in your car systems. For instance, it monitors the air temperature in your air filter, helping it to run your engine in the most efficient way.



When this light comes on it is telling you that the ECM has stored a diagnostic trouble code, or DTC, based on signals it is receiving. You could then go to a mechanic or auto electrician to have this code read out. In some countries (e.g. the USA) you can have this done for free at an auto parts store, or buy your own tool to read the code, called an OBD II scanner, for about $50.



However it goes, if you know the code, you will be much better able to judge what the mechanic tells you about the repairs needed, and the likely costs, The codes themselves are not very informative, and you will probably need to Google it or look up a maintenance manual. A code may appear as, for instance, P0131.



There are some codes which appear more frequently, and deserve special mention:

- Faulty oxygen sensor. There may be 2 or 3 of these in a car, and they do wear out.

- Faulty emissions system. The first thing to check is the fuel cap. It may be loose or require replacement.

- Faulty knock sensor. This enables the ECM to adapt to different grades of fuel.

- Faulty catalytic converter. This is part of the exhaust, next to the muffler.

- Fuel mixture too lean. This will usually be caused by an air leak in the intake, perhaps a loose air cleaner cover or cracked hose.

- Engine misfire. Often caused by old spark plugs or cracked plug leads.

Posted on Jan 09, 2013

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Posted on Jan 02, 2017

  • 20 Answers

SOURCE: the lights on dash board are not working only

New bulbs. OR you may have a foulty dimmer unit (just above the rear fog-light switch)

Posted on Oct 03, 2009

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