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

P237F

Exhaust Heat Exchanger Bypass Valve A Control Performance

Exhaust Heat Exchanger Bypass Valve A Control Performance: the component is electrically intact but its response does not match the command.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 7F

Possible causes

  • Flap stuck due to soot or carbon deposits high
  • Actuator gearing worn or slipping medium
  • Position sensor offset against actual flap angle low

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 250–1200 €
  • Estimated time: 1.5–4 h
  • Component: exhaust bypass valve a
  • Component: exhaust bypass position sensor a
  • MIL / check engine light
  • emissions-relevant

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