Speedometer got erratic and then failed on a 1992 Volvo 740 Station Wagon. I am told there is a circuit board that governs the speedometer. Is rebuilding the circuit board necessary or replacement warranted? What is the most likely source of a speedometer failure on this model and repair cost? Also odometer failed before I bought it. Does this have the same guaranteed to fail at 200K miles little plastic gear that the 240 has? Any help would be greatly appreciated. Thanks in advance

SOURCE: 1991 Volvo 740GL Speedometer

I remove two panel underneath the steering column. The first panel is removed using a 10 mm socket. The second panel is removed using a torx socket (can't remember the size). Removing these two panels gives you room to get to the clip on speedomter. Looking at the speedometer, you should see two rectangular holes on each side of the speedometer cover. I use a awl to push in the clip (you could use a screwdriver). Looking underneath the dash, you should be able to see the clip you are pushing on with the awl. I take my 2nd awl and put it behind the clip. I get the left side to release. One the speedometer cover releases, you can see the speedometer. You will see the 4 torx screws (t20) and two smaller clips holding the speedometer. All that is left is the wiring. (I take a sharpie pen and mark one of my wire locations on the speedometer. I am not sure what it does. It is a single wire.)

SOURCE: 240 volvo 's speedometer doesnt work

check the wires plugged to the rear axle center /pull on them/if its the odometer the replace the gear in the speedo head IPD site

SOURCE: 1989 volvo gl 740 speedometer and odometer

Your problem is NOT a fuse. The speedometer receives an electronic signal from an analogue transmitter mounted in the rear differential. It's the little button in the rear diff with two wires attached to it. Check to see if the wiring is chaffed or broken. If not, then it's probably the transmitter. A competent mechanic should be able to replace one for less than 200.00, parts and labor. If this does not fix it, then the problem is in the head, which can be expensive. You might get a used head if you can get a 90 day guarrantee on the part from the salvage company.

Good Luck!

SOURCE: My volvo 240 DL Station

I tink you have to replace the catalyst for better acceleration probably is blocking the combustion that's what you loosing power, I have 240 wagon 92 and i just did it. my 184k miles good luck.

SOURCE: My volvo 240 DL Station

check m.a.p. sencer on air inlet check if plug is loose could be
o2 sencer bad sending false info to comp. check if it has code at self check