OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Chassis generic / SAE

C0902

TPMS Sensor 2 Battery

The tyre pressure monitoring system has detected that the battery in tyre pressure sensor 2 is low or depleted. TPMS sensors are battery-powered with a typical life of 5 to 10 years and must be replaced as a unit when the battery fails.

SystemChassis
Typegeneric / SAE
GroupC0
Range / number9 / 02

Possible causes

  • TPMS sensor battery depleted (end of life) high
  • Sensor electronics failed low

Symptoms

  • ABS warning light on
  • ESC/stability control deactivated
  • Possible reduced brake assist
  • Speedometer may behave erratically

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 60–250 €
  • Estimated time: 0.3–1 h
  • Component: tpms sensor
  • Component: tpms control module

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication