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I have a 1996 mazda 626 lx 4 cylinder with 140k miles. after running on the highway for a half hour or so, my overdrive light goes on and off. i do not touch the on/off button. the car gains and loses power. mechanic thinks it could be the transmission?? I have had a lot of work on this vehicle the past few years. would you happen to know what it is and how serious. thanks.

Answers from the Automotive Experts

Amanda J. Pierce, MBA Dave, If it is loosing and gaining power it may be due to shifting into and out of overdrive. Your relay may have a short causing this to come on and off without command. Mazda did issue a technical service bulletin (TSB) for this # 0500502 telling how to compensate for this problem by installing a transmission cooling kit. You can download the TSB here http://www.estreetjournal.com/tsb.pdf (PDF)

Pat Fleischmann, Director of First Impressions at Community Tire Pros & Auto Repair Hey Dave~ A flashing OD light means there is a problem with your transmission. Your vehicle should continue to operate, but without overdrive capability, have it checked out at a qualified transmission shop for a full diagnostic. Your Mazda is almost identical to the Ford Ranger and thus should have a Ford transmission. When there is a problem with the transmission~ the OD light will either come on or Flash and sometimes the Check Engine light with come on too depending on what is wrong with the tranny. Keep in mind it could be a bad sensor on the transmission that controls gear shifting. A sensor at your local Ford dealership and if you have the ability to install would be a great fix for about $30.00. Another issue it could be is a Computer Chip malfunctioning... Do yourself a favor of $$ and time, have it diagnosed!

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