2004 Volvo S40 - Answered Questions & Fixed issues

Question edited for clarity. Better to buy OEM Quality sensors, but you can get them on Amazon and eBay, plus auto parts stores. https://www.google.com/search?q=2004+Volvo+S40+-+T20.+camshaft+and+crankshaft+sensors ..

As the driver's door is the most used side it can be just worn or a part broken, best would be to remove the interior panel and check that the inside lever is still connected to the lock usually there is a thin metal bar that connects the two. If it is connected and you pull the lever and the bar doesn't move or only slightly this indicates you need a new inside lever, if the bar does move freely then you have to look at the lock mechanism.

Hello. Most PCV valves are in the valve cover on most engines. They are, carefully, removed by tugging/pulling up on them. Also, replace the rubber grommet that 'seals' it into the valve cover. Good luck and keep me informed; if you want to.

When was the last time you changed fluids in your transmission, if never it could be that!? Good Luck Steve

Cannot figure out what that part is, but it has a vacuum line connected. Therefore, it should not be functioning unless the engine is running. I would have to guess there is a wire crossed in the key cylinder. The presence of the key should activate the warning system and perhaps deactivate the security system. However, the engine system wiring comes in proximity to the warning wiring behind the ignition switch near the contact reel. It's possible you have a short in that area. I am posting access instructions from autozone.com. CAUTION Models equipped with a Supplemental Restraint System (SRS), use an inflatable air bag. Whenever working near any of the SRS components, such as the impact sensors, the air bag module, steering column, and instrument panel, disable the SRS.

1. Before servicing the vehicle, refer to the Precautions Section.
2. Disconnect battery cable.
3. Remove steering wheel and air bag module. Refer to Steering Wheel removal and installation.
4. Remove steering column covers. Remove or disconnect the following: Screws from lower coverClip mounting between the upper and lower coversLower steering column coverUpper steering column cover
5. Remove the contact reel:
   1. Disconnect the left connector.
   2. Remove the screws.
   3. Remove the contact reel. Fig. Removing the contact reel from steering column Removing the contact reel from steering column
6. Remove the ignition switch:
   1. Disconnect the electrical connector.
   2. Remove the screws.
   3. Remove the ignition switch. Fig. Ignition switch removal Ignition switch removal

To install:

1. Install the ignition switch:
   1. Position the ignition switch and tighten the screws.
   2. Connect the electrical connector.
2. Install the contact reel. Tighten the M5 screws to 44 inch lbs. (5 Nm).
3. Install the upper and lower steering column covers. Tighten the screws.
4. Install the air bag and steering wheel. Refer to Steering Wheel removal and installation.
5. Connect the negative battery cable.

If we're talking about an automatic transmission, your symptoms indicate a valve body problem. The transmission control module or a shift solenoid inside the transmission can be faulty too.

If plans a fail,plan B drive 300 km. and fill up.

Hi James, The most likely cause is the fuel sending unit. When they go bad, you start getting erratic readings. Hope that helps.

There is a fuse for these. Fuse good and has power to it. Look at replacing the light/dimmer switch. If the fuse is good, you need to check for power at the switch plug. Could be a bad wire.. Power or ground.

You need to have ignition switch in the on position for two uninterrupted hours or two hours driving around with the radio turned on. It will say "OFF" on display. Once you do this you should be able to enter your code.

Most have a recessed allen screw, or star-key nut located on the back side of the knob...some are hidden by a clip on cover...look for at the base of the knob design...

There could be various reasons why it is being set off. It could be a faulty shock sensor, or you could have a battery drain while car is off. Alarms check for voltage changes while engaged. (That would mean you have an electrical problem) . the battery voltage may be too low. (Or a bad battery/charging circuit)or the alarm itself is malfunctiong.

Hi,

Do the following to clear out the service message 1. Press and hold trip odometer reset button
2. Turn ignition key to run position KPII (not the start position)
3. Wait 30 seconds or until service light begins blinking
4. Release Trip Odometer button
5. Turn ignition to off position

Thank you !!

Fish your ground wire down to the driver's side underneath the dash. There you will find all sorts of metal connections to the frame. Just loosen a screw or nut, and slide the wire and connector underneath and tighten. Look around the fuse box, there should also be a ground connection somewhere there. You can also splice or tap into an existing ground wire.

After you repair the fault causing the code you will need a scan tool capable of erasing the fault code. If it keeps coming back after that you have not repaired the problem. There is no other way to clear the code except a scan tool

Under the black plastic cover on the top of the engine. Take that off then take the coils off and you will see the spark plugs.

under the wiper arms is a big cover ,lift the bonnet and look at the back behind the firewall and where the wiper motor is and either side of the vehicle is a well and in the bottom is a drain hole ,look and find then make sure these holes are clear so any water can run out

engine breather blocked look and clean or replace may do the trick

Could be crankshaft sensor or cam.