Engine speed sensor (aka crankshaft position sensor) replacement

**flatfootedboy** · 07-16-2012 02:06 PM

Can someone describe how to replace the Engine Speed Sensor (G28) cable? We have a 2002 Audi S6 (V8, engine code BBD and the sensor cable part number is 077 905 381F). The top end was relatively easy to unplug from the harness but I can't seem to reach the other end, never mind undo the bolt attaching it. Can this be done from above or do I need to purchase myself some ramps/jack the car up? Thanks in advance for any pearls of wisdom.

**Scotty@Advanced** · 07-16-2012 05:49 PM

Originally Posted by flatfootedboy

Can someone describe how to replace the Engine Speed Sensor (G28) cable? We have a 2002 Audi S6 (V8, engine code BBD and the sensor cable part number is 077 905 381F). The top end was relatively easy to unplug from the harness but I can't seem to reach the other end, never mind undo the bolt attaching it. Can this be done from above or do I need to purchase myself some ramps/jack the car up? Thanks in advance for any pearls of wisdom.

You've got to do it from under the car. It's on the bell housing drivers side about 1/2 the way up to the top of the transmission. It's held in by a 5mm allen head bolt. Often the sensor wiring is wrapped around the rear water outlet so to remove the sensor it's easier to cut the wire and pull out the sensor and plug in separate pieces.

**flatfootedboy** · 07-16-2012 09:02 PM

Originally Posted by Scotty@Advanced

You've got to do it from under the car. It's on the bell housing drivers side about 1/2 the way up to the top of the transmission. It's held in by a 5mm allen head bolt. Often the sensor wiring is wrapped around the rear water outlet so to remove the sensor it's easier to cut the wire and pull out the sensor and plug in separate pieces.

Thanks so much for the quick reply Scott, much appreciated. I didn't notice the sensor wrapped around anything but I did feel loose fitting sleeve around it - maybe to protect it from heat? Is is it relatively easy to access the bolted end once you get the car up?

Thanks again!

**Scotty@Advanced** · 07-17-2012 04:24 PM

Originally Posted by flatfootedboy

Thanks so much for the quick reply Scott, much appreciated. I didn't notice the sensor wrapped around anything but I did feel loose fitting sleeve around it - maybe to protect it from heat? Is is it relatively easy to access the bolted end once you get the car up?

Thanks again!

If you have slender arms the bolt isn't that diffiuclt to get off. However with my Popeye forearms it can be difficult to get leverage on it.