C0907TPMS Sensor 4 Battery Low
- Generic OBD-II code · Chassis
- Needs a drive cycle to confirm a fix
- How the car detects it
- C0907 has no public owner: code lists, the NHTSA index and the GM, Saab and Mitsubishi service indexes all lack it. Per its title it flags a fading battery in transmitter 4. How that state is noticed: the sensor measures its cell through a voltage divider and sends a battery byte with each pressure message, as a CM Automotive patent shows. Mitsubishi stores C1940 for tire 4 in this case; once the cell sags further, the receiver stops hearing the sensor and the same family sets C1941 after roughly 20 minutes of driving without its ID. The 2011 Saab 9-4X handles it per corner, subcode 03 under C0750 to C0765. The code thus heralds a coming loss of signal; replacing the sensor before that avoids a dark pressure display.
- What you may notice
- TPMS warning lamp with a sensor fault message
- Later, dashes instead of a value for the affected wheel
- Likely causes
- LikelyTransmitter cell weak from age
- PossibleCold weather pushing an ageing cell below the warning level
- RareFault in the sensor's voltage measurement
- 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.