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Abs And Psm Lights


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I have a 2000 c2 Cab. About 2 weeks ago the abs and psm dash lights were coming on intermittantly. My mech said he couldn't find a fault, as the lights didn't come on when he test drove it (of course, the light never comes on for the mechanic!). He figured it was just dirt or something on the sensor, as the brakes and fluids were fine. Now the lights come on every time, as soon as I press the brake pedal. Any thoughts? Is my mech wrong? The car handles and brakes as it always has.

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  • Admin

Check your brake lights - they can also cause both lights to come on at the same time.

If your brake lights do not come on then that is the problem - start with the pedal switch and if that is okay check the grounds on the rear lights.

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Check your brake lights - they can also cause both lights to come on at the same time.

If your brake lights do not come on then that is the problem - start with the pedal switch and if that is okay check the grounds on the rear lights.

Thanks Loren,

As always you are a great help..

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  • 4 weeks later...

Brake lights are fine. Lights now come on every time I press the brake the first time after start up and stay on 'til key is off. Pads seem fine, braking is good. Any other ideas before I go to the mechanic for code reading?

Check your brake lights - they can also cause both lights to come on at the same time.

If your brake lights do not come on then that is the problem - start with the pedal switch and if that is okay check the grounds on the rear lights.

Thanks Loren,

As always you are a great help..

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  • 4 months later...
  • Moderators

Brake light switch, MAF, throttle body, ABS unit and faulty wiring/connectors, sensors, all work on ABS/PSM system. I would check for fault codes to start with, that is ultimately the cheapest way to go.

  • Upvote 1
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I had the same issue on my newly purchased car.

When i picked up the car, I noticed one of the brake lights was blown, so I thought the dash lights came on because of this.

When I got to the shop, it brought up an error about low brake fluid. So we filled up the brake fluid tank, replaced the blown light, and everything has been fine since.

EDIT: Mind my user name, I made this account 3 years ago when I had my old Boxster, the problem I'm describing was on my new 996 c4s

Edited by Boxster S_Gr
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  • Admin

I had the same issue on my newly purchased car.

When i picked up the car, I noticed one of the brake lights was blown, so I thought the dash lights came on because of this.

When I got to the shop, it brought up an error about low brake fluid. So we filled up the brake fluid tank, replaced the blown light, and everything has been fine since.

EDIT: Mind my user name, I made this account 3 years ago when I had my old Boxster, the problem I'm describing was on my new 996 c4s

If you want to change your user name just send me a PM with the name you want (best to check and make sure it is not already used first).

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