C0902TPMS Sensor 2 Battery
- Generic OBD-II code · Chassis
- Needs a drive cycle to confirm a fix
- How the car detects it
- C0902 cannot be traced in public sources; the NHTSA index only matches it inside an unrelated vehicle number. The title covers the cell feeding wheel transmitter 2. Which corner counts as number 2 is up to each maker; Mitsubishi numbers tires 1 to 4 and uses C1920 for a weak transmitter battery on tire 2. A CM Automotive patent shows how such a sensor watches itself: a resistor divider feeds the cell voltage to the microcontroller, every message carries a byte with that level, and the monitor lights a separate lamp once readings could become inaccurate. Honda splits the same fault by wheel, with codes 31, 33, 35 and 37. Because the cell is sealed into the transmitter, the fix is a new sensor plus ID learning.
- What you may notice
- TPMS lamp or a service tire monitor message
- Readings from one wheel update less often or vanish
- Likely causes
- LikelyTransmitter cell discharged after years of service
- RareSensor electronics drawing excess current, draining the cell early
- RareAfter rotating wheels the battery warning is attributed to the wrong position
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.