We have a 2004 S80, the check engine light came

first: you better have the car checked by the OBD-diagnostic tool at a Volvo dealer. -this shows the error codes of the engine etc.
Normally a good mechanic does that BEFORE any replacement of a possible faulty component....!
there is also a small chance that your "check engine" light is wrong and needs to be reset.

Hello,
Checking fuel injection system, ignition system and components
In the event of diagnostic trouble codes (DTCs), that affect camshaft control or camshaft reset valve, these must be fault-traced first.
The diagnostic trouble code (DTC) indicates which cylinder has misfired: ECM3533

Check that engine oil level is correct.
Check the spark plugs, search for damage in the insulation and other damage.
Check ignition spark.
Check the function of the crankcase ventilation.
Checking fuel and residual pressure. Checking fuel and residual pressures See: Engine, Cooling and Exhaust\Engine\Fuel Pressure\Testing and Inspection\Checking Fuel and Residual Pressures
Check if there is any air leakage. Check for air leaks in the intake system See: Powertrain Management\Fuel Delivery and Air Induction\Testing and Inspection\Air Leaks in the Intake System, Checking
Check that the engine seals tight. Compression test See: Engine, Cooling and Exhaust\Engine\Compression Check\Testing and Inspection\Compression Test
Check flywheel for damage. I have also seen these ECU's fail.
Finally, one thing you can try is called a "hard reset" by disconnecting both battery cables and hold them together for about 3 to 5 minutes, not letting them touch anything else. After this hook them back up and take it for a test drive about 10 miles. The adaptive memory may reset things back to normal. Please advise

either a coil pack or one of the O2 sensors playing up check the sensors with diagnostic tool ,use the pid and with engine running and someone else driving you check the readings for everything especially the O2 sensors

You might try turning your switch on and off several times. If the fuel cap is on right then it should eventually go out anyway.

Hi there,

Firstly, when starting the car, ALL warning lights should illuminate briefly - this is a self test to ensure these systems are working ok. When the Engine Check light remains illuminated, then a fault has been detected.

Code P0011 can be triggered by the following issues: Improper camshaft timing, wiring problems, continuous oil flow to the VCT piston chamber, faulty timing valve solenoid.

Due to the possible causes above, only an authorised Volvo service agent will have the correct scanning/diagnostic tool to identify where the problem lies.

I recommend you have the service agent carry out a further diagnostic...



Regards,

I took the car to volvo garage in the morning . They found out that there was a cut cable in the engine compartment near the throttle valve.
Anyway i want to express my thanks to you for your immediate response.

Regards
George

ebay for comp unit
were thyt volvo o2 sensors

Bulb position light failure indicates that you have a burned bulb somewhere around the car. Check all of them. Brake lights, parking lights, flasher and so and so.

This is a very common problem with Volvo.

You could alo get this problem eventhough no bulb is burned. If it's the case, test each bulb contact in their socket playing with them. Make sure you put some electric grease on contact replacing the bulbs.

Check if there were a recall for your specific vehicule and if it has been done on yours. I know that during the years, some recalls were adressing this type of problem.

Regarding whistling noise during warm up try to remove oil filling cap during engine is running. if the noise stops it's probably the PCV that is blocked and need to be replaced. If it doesn't fix it, let us know and we will go more in depth.
Hope it helped
Dan

You will need to have your engine diagnost to find the exact problem. Autozone will do it free and let you know what you need.

Check fuel pump is working when ignition put on to position 2. Check key transponder. Hope this helps