Hello- I have a 97 volvo 850 wagon that annunciates the abs and trac light at start up and then usually goes out in a minute or so after engine start... however.. both lights will intermittently stay on after engine start and not go out or will come on while driving... Assuming it is a sensor.. is this something a can buy and replace myself?
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It's impossible for anyone here to give an estimate because rates and parts availability vary from state to state. I'd call your local Volvo dealer parts department to get an idea of the parts costs or even if they can find one. You may have a better chance of locating the parts in a junk yard.
There are actually two gears that you need to replace, a large one and then smaller one that rides inside it. You can purchase them both at www.fcpgroton.com These can also sometimes affect the operation of your speedometer. Do you by chance have an ABS and TRACS light on? If so the speedometer issue may be related to your ABS controller.
Two questions: Is your odometer working? If not then it's probably a broken gear by the stepper motor that Emissionwiz mentioned. Is your ABS and/or TRACS light on intermittently or constantly. If so that is a common sign your ABS control module has gone or is going bad. This usually happens before the speedometer starts acting up. Either one of these will start intermittently and finally end up with the speedometer not functioning at all, and both are pretty common failures with this model.
Check and make sure that the brake lights are working. It may be the brake light switch.There is a possibility that there are two separate issues though. You can have a bad ignition switch also.After starting the car move the key slowly towards the off position or wiggle the key and see if the abs/tracs light goes off.
I will bet money that it is the ABS/TRACS module. It is mounted under the master cylinder on the bottom of the ABS unit. These are very, very, very common failures. I have replaced hundreds of them in my career. To answer your other question, the TRACS system uses brakes. For example: in the snow, when the L or R wheel is spinning faster than the opposite, the TRACS will apply brake to the spinning wheel to slow it down to an equal speed. Hope this helps.