Volvo S40 Questions

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My brother brought me his s40 and said it has no reverse and wanted me to check it out. I opened up the trans and it smelled like gear oil so I asked him about it and he said he put gear oil in the front differential. WTF! I explained to him how this transaxle works and he said woops. I rebuilt the valve body and replaced two solenoids that were bad, flushed it out and replaced the fluid. The car was now trying to go into reverse, so I put it through the gears and kept checking the fluid until it was full and tried again. I put it in drive and it worked fine, I put it in reverse and the rpms dropped but would not move, except for a feeble attempt. I put it in park checked the fluid, put in in reverse and it went forward, not backward. It now has no drive, only goes forward in reverse. How do I trouble shoot the the computer and the gear selector to find the problem. The problem isn't the cable.

Happened once

it is S40, 1900 cc. regular gear.

Only starts after car has been running for over 1/2 hour or so. May start sooner on a hot day and/or in constant traffic.

Does not appear to come from the engine.

Can hear it best in rear seating area, and sounds like it's coming from under the console back there.

Can hear from outside, sounds like it's coming from under the car.

Repair was made to gear selector problem and drove the car a short distance and it went dead. It is showing a P0603 code - but I've been told this could be a failed starter control module?? HELP

the terminals on my battery were cleaned, and now nothing in the car works no lights and wont turn on. however there is a clicking sound under the passenger side dash and a little light barley flashing???? help

Is there a special tool needed to replace the timing belt

I am having water pooling in the drivers side rear passenger floor board
And the front passenger floor board

I see from the posts that there is a tube from the sunroof
It might be clogged

How can I find this tube and possibly unclog it

I am a amateur at car repair

If this isn't the problem is their something easy that I
Can check to help solve this problem

Thank you for the help

Trying to find a replacement part

While driving, happens more and more frequent (4 or 5 times today), if I shut of a/c for a few mins and turn back on it works like normal for a little while

Car is stuck in park gear.

cools for a little while then shuts off or blows hot can cut off a few minutes and then turn back on and its ccol again.

brake sensor

I saw previous answer referencing the blower box. How do i access it. I have no idea where it or the cabin filter is located.

I can see where coolant is leaking from two hoses and took it in to be serviced. The est. came back at just over $900 to repair the Gasket-Thermostat, hoses, and coolant system service w/ extended life. Is this all necessary. I guess what I'm asking, does the gasket/thermostat need to be replaced if the collant is leaking from the hoses?

It was working fine before I replaced the battery with another CR 2450 battery. Now, it doesn't work at all. Please help.

Dear experts I have a 2002 Volvo s40 turbo runs and drives find but the engine oil is mixing with the antifreeze the engine oil itself stays clean only going to the antifreze need advice plz my email is thank you

Dear experts I have a 2002 Volvo s40 turbo it runs and drives perfect> no oveheating either the engine oil is clean but the problem is the engine oil is mixing with the antifreeze and like I said the engine oil stay normal need advice plz really appreciate thx

I had the serpitine belt replaced because it broke along with the timing belt and its components but car still wont hold pressure. Does that auto matically mean its valves and or pistons are out or could be something else. When serpentine belt broke I heard it and stopped right away.

I was at a redlight and about to make a turn and the car just shut off. I did not see any warning lights on just the oil light/ car did come back on/ what should I do? It had never done that before

car runs fine, but I don't feel any boost or hear the turbo whine.

115,000 miles replaced crank/cam shaft seals, timing belt, water pump, valve, still leaks small amount of oil near front passenger side.

Any idea what could be wrong with it? It's a 2007 Volvo s40.

I bought a 100K miles Volvo s40 2004 and have diferent issues: Hard start ( almost 15 seconds to start), when in cool ( after nightrest, teh engine sounds no good until down revs to 0 but did not switch off next the engine keep in 300 or 400 rpm), smell oil or gas it´s hard to say, but smells something, the arrow light ( winter) start to intermitent flashing when its running ( last night when I put reverse, the trasmition box move hard and start the arrow light flashing ( intermitent), when start the air conditioned the car rev´s put down until switch off the engine ( this is consecuence of the 300-400 rpm on the odometer, i think!!). thanks for the help....