93 Mercedes 300CE code 06

[bgsellers]

We have a 93 Mercedes 300ce with ASR that keeps going into limp mode with a code 06 and the asr light on. The computer connections have all been cleaned. The ETA makes the mechanical sound as the motor turns (actually had tried a new one but no difference). the sensors have all been cleaned, brake light switch replaced. The ASR light does come on if you start car w/foot on brake. the battery voltage is fine. tire pressure is good. Can anyone help? You can turn car off, then back on again and will be fine for a while.