1991 500SL Well, I was driving on the freeway and for some reason, the car got stuck on 4,000 RPM and it started to lag. As I exited, I was accelerating and it felt like I was hauling something and was making a really loud noise but it's not doing that anymore, yet after the situation, the check engine light came on. Another question is how do I change the fog lamp??

 

Sounds like you're in 'limp home' mode....do you have an owners manual? It explains what the car's doing and quite possibly why.

Bob

 

Text out of an Owners Manual...

Emergency Operation

(Limp HomeMode)

If vehicle acceleration worsens, or the

transmission no longer shifts, the

transmission is most likely operating in

Limp Home Mode which engages when

there is a malfunction of the

transmission. This condition may be

accompanied by the "CHECK

ENGINE" malfunction indicator lamp

in the instrument cluster coming on.

In this mode only the 2nd gear or reverse

gear can be activated.

To engage 2nd gear or reverse:

1. Stop the vehicle.

2. Move selector lever to

position "P".

3. Turn off the engine.

4. Wait approx. 10 seconds.

5. Restart the engine.

6. Move selector lever to

position "D" (for 2nd gear), or

move selector lever to

position "R" (for reverse gear).

Have the transmission checked at your

authorized Mercedes-Benz dealer as

soon as possible.