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Alright, odd occurrence this morning on my wife's way into work. The Tracs light went off, then a few miles down the road, the ABS light went off.<P>Here's what I know. The car was just in for an Oxygen Sensor replacement. The rear brakes are also near worn out.<P>Either something failed, there's some sort of brake pad indicator that set that off, or something got accidentally done while it was in the shop two days ago. Anybody ever see this before?<P>George
 

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Oh the joy of Volvo ownership!<P>More than likely, you have another problem. My car does not have TRACS. I have had my ABS light come on. It was another one of those nasty sensors that like to fail.
 

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I have the same problem with my V70R....seems to be a common problem from what I've read. I wish I had an answer for you George. My car can go for weeks without the lights coming on, but this week the lights have come on twice. I just think it's a sensor going bad or maybe dirty. I read a post earlier about cleaning the sensors. Has anyone done this? What would you use to clean them?
 

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I just read that other post. Perhaps Sean will respond, as he was the one who suggested they be cleaned, and it sounds like that's your prob Larry as yours is intermittent.<P>Mine is on all the time, at least so far, so I think mine is a failed sensor.
 

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Try to get the codes red out it will give you the problem area without checking the entire system but if you want to check this on your own, first visual inspection of the wires going to the wheels-front wire come down from harness near drain tubes for the wiper cowl along the body to the spindle, at the rear they come down the pass side fornt of fuel tank then run along the rear susp, for all us 94 & up you will not have connectors at the rear hubs the sensors are one piece with the harness earlier cars were harness and two sensors with conectors. To clean the rear sensors, press rear pads back with channel lock pliers no need to remaove pads from calipers unless they need serviced and cleaned as well clean pads along the edges and the hardware as well,pins&shims, remove the two 13mm caliper bolts swing caliper away from disc and let it sit on the lower sring mount of the suspension. Find the adjustment star wheel for the park brake shoes, locate it at around just off of 12 o'clock. The purpose of the extra hole you will see on you rotor is for the adjustment, click downwards to slaken off shoes, remove 10mm disc pin , and use a rubber hammer to tap on disc with shoes backed away correctly the disc should pop off. Use some soap and water to clean sensor, and pulse wheel, DO NOT use air as this will get into your lungs not good! Do not scrape any components as you will damage them, after the wash blow dry, lube the parking brake pivot and check that the hub mounting surface is clean to aloow proper mounting of disc, take the time to sand down the rust ridge inside the rotor where the park brake shoes sit can be noisy, may as well do it all while the car is in pieces, put it back together in reverse order, click star wheel upwards until you can not turn it anymore the disc will be locked with the shoes on, now back off star wheel click downwards 4 clicks that is the proper distance for the shoes to be away from the inside of the drum or adjust until the drag sound correct when the disc is turned by hand, do not leave it to tight it will be noisy, as soon as you fell you have this adjustment set reach in the car and check the hand brake function. This would complete not just the ABS cleaning but the park brake as well as rear pads. If you are not comfortable DO NOT try this! If you get your codes I can tell you what they are. Hope that helps boys sorry its a bit long but I do not want to leave any parts out.<BR>Sean.
 

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I am not having any TRACS or ABS issues however I am going to replace my rear brakes later this month. George, if you need a hand and I can pull away from work, I will help you after I do mine. Looks like something we can do in your garage one evening.<P>Prospero
 

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I had a simular problem with my 850. Well, it was a little different. When I would start the car, the abs light would come on, then down the road, the tracs lithg would come on for a second, and then they would both turn off... I later found that when the abs light was on, the headlights and turn signals wouldn't work. Well, I took it in to the local shop and hooked it up to the computer, and he was getting two abs failures from the back two wheels. To make a long story short, it was the ignition switch. If the key was all the way forward, the problem would be there, if you turned it back a hair, the tracs light would come on for the half a second and they would both turn off. Oh well, guess thats just one thing that you learn to live with until you are ready to make another big trip to the shop.<P>--Austin
 

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George and company... Greetings!<P>Sunday during a trip to and from 60 miles away I had the same thing!!!?!!!!<P>During the trip over there was some rain and we had no dash lights come on until I was at the end of my drive and ready to park. Both TRACS and ABS came on. I shut car down and restarted and no lights stayed on.<P>On the way home there was a bit heavier rain and maybe 15 miles into the 60 and while approaching a toll I had both the TRACS and ABS lights come on again.<P>The car appeared normal - wifey read the manual as I blasted away from the toll. We ignored the books telling us to not continue driving if the lights remained on.<P>Now yesterday and today in it's commute to and from work it appeared fine. No warning lights.<P>I also had just had the front oxy sensor replaced as well as all brakes pads. About three weeks ago.....<P>car has 83K on it.<P>I can't (and would like to avoid) taking it right back to the dealer.... I'll see how it goes the rest of the week.<P>
 
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