I just installed one of these fix brackets on a 2011 Jetta with 126K. It took 8 minutes including before and after MB121 readings.
Before I installed the part, mb121.4 was 0.456V
After is now 0.760V
These Voltages correspond to the motor's position when flaps are open. Jim and I measured a brand new manifold from VW. Guess what? 0.760V.
As the stop on the flap rail wears, the motor arm is allowed to move farther and farther back. The voltage signal gets lower and lower until it reaches 0.304V and a fault is set. As far as I can tell this number changes in discrete decrements of ~0.076V as the flap stops wear down.
Jim's fix bracket butts up to the motor arm and stops it from physically being able to move any farther than a position corresponding to 0.760V. It will never get any lower than that.
Just read mine, 0.608 Volts on the original part. No codes. My replacement part is sitting 2800 miles away on the east coast. Was hoping it would arrive before I drove out to SoCal but the US postal service tool their good old time delivering it 3 days late. Would have loved to install it before the trip back to east coast next month, to see if effects my fuel mileage. Over the last 10-12 months, mine has really taken a hit.
Address 01: Engine (03L 906 019 CL)
14:50:33 Group 121
-3.2 % Lambda
4.7 % Lambda
00000100 Bin. Bits
0.608 V Voltage
Friday,19,December,2014,15:06:07:27850
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 14.10.0.0 (x64)
Data version: 20141022
VIN: WVWNM9AJ0AW292558 License Plate: 3LOG
Mileage: 81714 Repair Order:
After install next month, I'll report back on the measured voltage.
4 Feb 2015,
Finally installed by removing the motor, as Jim recommends. I have the 1st version. No issues. Watch his video. Came in handy when reinstalling the spring correctly. Also, has a good recommendation to slightly crimp the end of the spring so it remains on the motor arm.
Read voltage after starting and reads exactly 0.760 volts, as expected! The other values are. Slightly different than the before values.
-2.4 % Lambda
0.8 % Lambda
01000101 Bin. Bits