Intermittent speedo problem after suspension work?

1999 Saab 9-3 138,000 miles, manual transmission

Took into a local shop to have front shocks and struts replaced. They also replaced the right front control arm, because they said that a bolt hole had been stripped and so badly worn out of shape, the car would never stay in alignment.

Two days and twenty miles after I get it back from the shop, the speedometer goes out and three warning lights go on ( “ABS”, “Brake” and the central warning light ( triangle with a “!”) ).

I pull over and check the brake fluid level and oil, which are both fine.

As I take it back to the shop, the problem comes and goes at random.

At the shop, the futz with it for about 20 minutes, and then say can’t find any loose connection. Signs point to a bad rear wheel speed sensor, and I should make another appointment to bring it in.

Seems like a huge coincidence to me.

Any thoughts?

Never used this shop before, but they’ve been in business for 40 years, and have a good reputation.

Problem diagnosed: faulty ABS control unit.

Here is a link to a very detailed procedure for pulling one. It can be rebuilt for a few hundred bucks:

Or you can order a new one from Saab for $3000, about the priice of one black market kidney.

I had an intermittent speedo problem once, I changed over to boxer type trunks.

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