1 month ago
Here at The Zed Shed, we don't do "diagnosis by guesswork" we use the best equipment available to correctly test components rather than just spend your money replacing them in the hope that a fault will be cured.
An example is this 14 plate Zafira Tourer with a "Check ESP" message in the display and a constantly pulsing brake pedal. The owner took it elsewhere and laid them to fix it, they diagnosed a faulty abs sensor, but that didn't fix it so it came to us.
Using the picoscope to test the output and compare it to the other side, and then swapping the sensors over revealed it to be low output from the magnetic ring on the bearing. As a new hub is around £150 alone, I decided to investigate further and discovered the problem was actually a broken thrust washer that normally sits between the driveshaft and rear of the hub. Particles from it had gotten onto the magnetic ring and were affecting the signal received by the sensor. Fault fixed with a part from Vauxhall that cost FIFTY SEVEN PENCE!
Proper diagnosis saves time AND money!
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