TPMS relearn
TPMS relearn after a tyre change: why the light stays on
A TPMS relearn tells the car which tyre pressure sensor sits on which wheel. When a customer comes back with the TPMS light on after new tyres, a rotation or a new sensor, the car usually has not learned the sensor IDs yet. Here is what to check, in order.
The TPMS light often stays on after tyre work because the car does not recognise a sensor or its position. Check that every sensor answers a TPMS tool, replace or program any dead sensor, then do the relearn the car's maker specifies: automatic driving relearn, stationary relearn, or OBD relearn with a tool.
01Why the light comes on after tyre work
Each direct TPMS sensor sits inside the wheel and sends its own ID and pressure to the car. If a sensor is damaged when the tyre is changed, its battery is flat, or a new sensor has an ID the car has never seen, the system cannot match it and the warning light stays on.
On some cars, rotating the wheels is enough to need a relearn, because the car shows pressure per wheel position.
02Checks before the relearn
- C1Set the pressuresInflate every tyre to the pressure on the door label first. A low tyre keeps the light on even when the sensors are fine.
- C2Trigger each sensorUse a TPMS tool at each valve to read the sensor ID, pressure and battery state. A sensor that does not answer is the first suspect.
- C3Replace or programFit a new sensor, or program a blank programmable sensor to match the car, before you start the relearn.
03The three relearn methods
Car makers use different procedures, and the right one depends on make, model and year. A TPMS tool shows the procedure for the car in front of you.
- Automatic: the car learns the sensors while it is driven for a while
- Stationary: the car is put into learn mode, then each sensor is triggered in a set order
- OBD: the tool reads the sensor IDs and writes them to the car through the OBD port
If the light still stays on after a correct relearn, scan the TPMS module for fault codes: the fault may be in the receiver or the module, not the sensors.
Questions
Do I need a relearn after every tyre change?
Not always. It depends on the car and on whether a sensor was replaced or the wheels changed position. The procedure for that make, model and year tells you when a relearn is needed.
Can I reuse the old sensor in a new tyre?
Often yes, if it still answers a TPMS tool, its battery is good and it was not damaged when the tyre was removed. Check it before you fit the new tyre.
Which Autel tools does K Tech supply for TPMS work?
K Tech supplies Autel MaxiTPMS tools for sensor programming and relearn. WhatsApp us your car brands and the jobs you do, and we will suggest the model that fits.
Not sure which tool fits your jobs?
WhatsApp us your car brands and the jobs you do. We suggest the Autel tool that fits.
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