It's on the passenger side, looks like it would be attaching to the car in the direction of the fuel door, maybe (?), and nothing seems to happen when I move it, but what the heck is it?

Manual unlock for the fuel door. If it doesn't electrically unlock like it should (mine certainly gets iffy in ...

For a while, I've had an occasional high-pitched whine from somewhere up front in my '93 850 while moving -- never happens when I'm stopped, and it's hard to tell exactly where a sound that high is coming from. (I think it's engine compartment rather than front wheels, but can't be entirely sure ...

Does it plug into the existing wiring harness directly? If so, you can redirect pin 3A from this diagram through the switch's antenna contacts. Doesn't matter which side is "in" and "out", and pins 1 and 3 are connected internally. Since I didn't have the switch's wiring kit, I used crimp-on quick ...

1/2 inch works if you have an early-style tensioner where the hole is part of the upper lip, not in the center of the pivot. However, I think those are only found in '93 models.

I think it may be a typo on FCP's part. The exact same item number, Wahler 271664, is listed as 92 °C at FCP and 90 °C at eEuroparts.

Does the harness still fit the switch? If so, and there's no additional wire going to the spare pin, I'd expect it to be okay.

This is completely anecdotal, but the antenna switch you can get in the '95-and-later trim style has 5 pins on the actual switch body, and only 4 wires going into the OEM ...

I'm helping clean up a 1991 240 wagon which has a few dead interior bulbs - the A/C and seat warmer switches don't light up anymore. I haven't dismantled the switches yet to take a look at them; do they have easily replaceable bulbs, or is it a resoldering job like the early 850s? If the latter ...

Does your instrument cluster light up like it should when the headlights are on? If not, try sliding the lighting intensity control (over the rear fog light switch) back and forth several times. The contacts inside the slider might be dodgy.

If the doors are working, it's also possible that the tweeter magnets in the shelf speakers have fallen off and gotten sucked into the main cone - after which neither part works too well! It's a simple fix with some good epoxy. To check, remove the four 9mm nuts holding the shelf speaker units into ...

'93s, '94s, and early '95s have codes that can be read directly from the diagnostic module a few inches behind the passenger headlight - no additional accessories required. Most engine codes are read from socket A2.