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Most Mercedes Benzes made in 1993 to 1995 have problems with throttle bodies also known as electronic throttle actuator or ETA. Most ETA’s problems are due to shorting wiring inside ETA loom and some due to internal components failures. When ETA fails car goes into so called “ Limp Mode”. On this page you find common symptoms of faulty ETA and explanation of my repair service.
There are ASR and Non-
Cars that are not equipped with ASR option have slightly different symptoms-
In both ASR and non-
Throttle bodies made in 1993 for 600SL ONLY and all others made in 1994-
If you experience problems with your throttle body feel free to contact me and I will be able to repair your ETA. At Mercedes dealer new ETAs cost range from $1200 up to $5400 for V12 models each. And it doesn’t make sense to buy used ones as they use same biodegradable wiring insulation that can fail pretty fast. Even if ETA worked fine in the car it came from wiring fails as loom gets bent and twisted during removal. I have lots of customers who lost money buying used ETAs that failed either right away or after some sort time after. In the end they had their original ETAs mailed to me for repair.
Some small percentage of ETAs, about 5%, have internal parts failures. I have repaired motor brushes, electromagnetic clutch coils, replaced potentiometer metal sliders. These parts are examined during ETA disassembly and bench test prior to rewire and customer is informed on any issues with internals.
REPAIR PRICING as of 2015:
As of 2015 repair prices are below plus shipping and processing cost. There is 3% processing fee for PayPal and Credit Card payments.
93 (600SL ONLY) 94-
Clutch coil or motor repair on ASR models -
Clutch coil repair on non-
One can check internal wiring insulation by making 2” incision along center of actuator loom, spreading outer cover apart and inspecting wiring. Below are pictures of bad wiring. Also, check production date before mailing unit over. Scroll down for throttle actuators general information video and removal instructions