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I take it you donīt have TPMS Tire Pressure Monitoring System via pressure sensors, but the ABS based indicative system, which counts wheelspeed.
System does not count real wheelspeed, but difference between rotational speed on wheels. i.e. you can change wheelsize - if on all four.
After change of wheels, you need to calibrate - with correct tirepressure.
My reading is that one of the ABS sensors, does not send signal to system OR system is inactive.
IF I am right, you are in no real trouble.
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