w124 1989 300E 250K km\'s error code 20

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w124 1989 300E 250K km's error code 20

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10-17-2005, 07:35 AM

benzdriver737 benzdriver737 is offline

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Join Date: Oct 2005

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w124 1989 300E 250K km's error code 20

Engine running at operating temp, getting error code 20 (constant 19%)
Using pins 2 and 3... the official explanation from the w124 CD...
'Full load contact incorrectly connected or faulty. 20% readout only if throttle valve switch (S29/2) operated.'

S29/2 = throttle valve switch.
Throttle Valve Switch.... is this part available seperately, or is it connected to the throttle body and that is the only way it can be fixed/replaced. I haven't been able to find one in any of the online spares dept's. (TVS that is)
Anyone else been down this road.?

Last edited by benzdriver737; 10-17-2005 at 07:36 AM. Reason: amend title

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