Got an ESP warning light on my '01 TT Roadster. Confirmed via VCDS that it was the G214 brake sensor. G201 showed normal changes with brake pressure, G214 was frozen at some very high number. Replaced this sensor (with virtually no brake fluid loss). Now VCDS readings show normal pressure increases with brake application (on both sensors), but the zero pressure pt on the new sensor is at -12 bar (outside the +/- 7 bar standard). How the heck do I set this downward? I have an authorized RossTech VCDS and have done a manual bleed of the front brakes. The brakes feel very firm but I still have the warning light...I assume because of the off-nominal zero setting. Seems like I ought to be able to do an adaption, but can't seem to get through it. Any help for a VCDS beginner??? Thanks!
Still looking for some BTDT help here. Even though I get a "electric circuit failure" fault as shown below, the G214 circuit appears fine when I exchange leads with the operational G201 (sensor 1) and indeed the identical fault then becomes associated with the G201 sensor. This leads me to believe that everything downstream from the sensor wiring, including the ABS module is fine. The fact that the realtime OBDII data shows that both sensors (201 and the new 214) are providing good proportional signals with varying brake pressure further leads me to believe that the problem is a simple offset bias for the new 214 sensor. Ross-Tech publishes a procedure to adjust this value using Basic Settings, but my system gives me the words "adjustment not possible" when I go to group 066 following the Ross-Tech procedures. I will admit that I procured the new sensor from an online source rather than the stealership. It is identical in appearance to the old one and even has the Audi logo printed on it.
Code:
1 Fault Found:(
00813 - Sensor 2 for Brake Pressure (G214)
57-00 - Electric Circuit Failure