Question
Why do some TPMS sensors show stable pressure but unstable temperature?
Answer
Pressure cells are highly stable; temperature readings depend on PCB heat balance and battery condition.
Explain
The pressure transducer uses a stable MEMS design; temperature is measured via a small thermistor on the PCB. Aging batteries or damaged PCB shielding cause thermistor drift. CHEPQ tools detect this by comparing sensor temp to ambient temp (should be within 5°C).
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