Jaguar XJS indicates 10 mph slow after return from shop. Mechanic said he forgot to do something. He no longer works in area. Any idea?

 

What work was it in the shop for? Seems like an odd symptom to result from someone forgetting to do something, unless he forgot to put the correct wheels or diff back on it!

 

I recently solved my speedo issue, had to replace the speed sensor on the tranny. But mine had the classic symptoms, either it would sit on zero, or jump all over the place.

It's a pretty much "plug and play" repair, take the old sensor out and put in the new one. There is no adjustment or calibration needed. Not sure what he could have done to make it act that way.

Of course, maybe the one he put in is bad and failing in a different mode. It's fairly easy to replace, you can certainly do it yourself if you have jacks/ramps to elevate the car a bit.

Thanks,
John
1987 XJ-S V12