The Lambda Sond light is on in my son's 1983 244 GL. His inference, reading the manual, is that this is basically the same meaningless light as the "service engine" light that comes on to remind people to service their engine, not as an indicator of any trouble. Assuming that the engine runs fine, no smoky exhaust, no suspicious power loss, is it correct we just need to reset the switch that caused the light to come on? (Within the last 8000 miles we cleaned the PCV, replaced plugs and ignition wires).

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83 240 GL

Hay Low:

Just did this on my '83 245 wagon. For me, there was a little box spring clipped to the underside of the dash, up above your left leg. I had to lay on the floor to see it. Mine was not high up, but kind of hidden. There is an aluminum colored spring clip that holds this mechanism up and out of the way. I recognized it by the little speedometer looking cable that went to it. I took a flat blade screwdriver and pryed the clip and out came the box. There was what appeared to be a stainless steel screw hold yet another smaller box down. It looked like and adjustment of some sort as mine had some kind of white seal that looked like it was broken by taking off the screw. Once open, there was a brown bakelite looking button to push down to zero the 30,000 mile counter. I pushed the button down, then unplugged the cable and tucked it safely out of the way. With the maintenance that this '83's getting, there will be no need for any 30K reminders.

Hope any and or all helps!

Sincerely,

JBeechcraft

There is a recent post on exactly this situation.

You can (1) reset the light and the light will come back after XXXX miles.

(2) Disconnect the whole system - which is what I did.

Behind the instrument cluster, up in that nest of wires, is a black box similar in size to a cigarette pack. It has a push button to reset the light, and a cable connected to the speedo to count the miles. Remove the cable from the box.

Remember to check/change the 02 sensor every 100K or so.

Good Luck,

Bob

:>)