dbarnes is right, it is only a DIY operation if you are able to unseat and re-seat the tire bead. The sensor is mounted underneath the tire.
When taking a sensor out and re-installing it, you should get a rebuild kit for the valve stem to ensure an air-tight seal. Rebuild kits are not expensive, generally about $5 each. We have them available for $4.50 each.
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I have accepted a new position at Tire Rack and am no longer in the sales department. gary@tirerack.com is available to assist with M3 questions.
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