It could be one of 2 things the cam sensor or the co sensor on the exhaust, both of these when warmed up will set off an eml light and confusing error codes. as when engine is stopped they reset themselves. but codes will be logged and they need to be warmed up again. cam sensor faults is when the resistance in the sensor become erratic. as it has volts on the sensor will go up and down. co sensor can be the heater as it has to heat the sensor to make the sensor reliable. it takes a few seconds for the sensor to read. if it fails and come up on eml light but then turn engine off and then start it again it can be this cam and crank sensors work the same way they can over heat them selfs of time and will both need replacing, i found its best to replace both at the same time.
SOURCE: spare key
Well depending on if its an electronic key, or has an anti-theft module on it, you may be forced to purchase from the dealer.
On the other hand, you may just be able to go to a local locksmith and save some bucks! hope this helps!
SOURCE: ENGINE MISFIRE AND SHAKING
check your wire harness on the top of the engine. Volvo must have bought harnesses from Mercedes. The insulation just cracks and disintegrates, then the wires short. Not good for an ignition system.Once they short It can fry the circuit for that cylinder in the computer. Does not set a code other than Misfire.
SOURCE: radio display reads off for 2002 s40 volvo/cd player wont work
Hello there. I have a Volvo V70 that I bought recently and it had the same problem. I left the ignition switched on for about two hours and after that time the reading had changed from OFF to Code. I then entered the code and Hey Presto It worked. When I purchased the car it too had no code. I went to a Volvo Dealership, with proof of ownership of the vehicle i.e. Log Book and proof of ID , I used my Passport, and they gave me the radio code.The only dowside was I had to pay them £10 for this code but I feel it was worth it. I suggest you try this too. Good Luck.
SOURCE: volvo 850 wagon failed NOx emissions test - badly!
Hey Pitloops!
It seems likely that one or both of your o2 sensors are acting up, or that your engine is sucking in unaccounted air from a leaking vacuum tube. Spray the tubes with "start gas" while the engine is idleing. If you hear it revving up when you spray the gas on the tubes you'll know there's a leak.
I'll sacrifice a squirrel for you and hope that the problem isn't your o2 sensors since they can be expensive to replace. Fcpgroton.com is probably the cheapest part supplier online if you'll need new sensors.
You might also want to clean your throttle body, as it usually gunks up with carbon deposits and sludge over the years. It only costs you the price of the carb cleaner to do it and the car will probably run better afterwards even if it doesn't solve the problem.
Good luck!
SOURCE: Volvo S40 noticed severe wetness behind passenger
It could be a seal, that isn't.
Also if you're ventilation system has got leaf debris, or general build up, the drain for the overflow, (which are usually located in the front arches) may be blocked.
Hope that helps.
The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the Check Engine light (or Service Engine Soon) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.
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