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!

Powertrain generic / SAE

P0173

Fuel Trim Malfunction Bank 2

Fuel trims on bank 2 exceed adaptation limits in either lean or rich direction. The ECU cannot maintain stoichiometric mixture within calibrated boundaries.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 73

Possible causes

  • Oxygen sensor bank 2 aged high
  • Vacuum leak bank 2 side medium

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 100–600 €
  • Estimated time: 0.5–3 h
  • Component: oxygen sensor
  • Component: mass air flow sensor
  • Component: fuel injector
  • Component: intake manifold
  • MIL / check engine light
  • emissions-relevant
  • drive cycle required

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