Emissions

P200F — Particulate Filter Over Temperature (Bank 2)

Severity: high Drive with care, to a shop

What P200F means

The control unit received exhaust temperature data showing the bank 2 particulate filter ran hotter than its allowed limit. The filter normally burns off soot in a controlled regeneration cycle. If temperatures get out of control, the filter can crack or melt, so the ECU often limits engine power to protect it.

Symptoms

  • Check engine light on
  • DPF warning lamp lit
  • Reduced power or derate mode
  • Possible smell of unburnt fuel
  • Noticeably weaker performance in severe cases

Possible causes

  1. Stuck or incomplete DPF regeneration
  2. Faulty exhaust temperature sensor
  3. Misfire or mixture fault sending excess fuel into the exhaust
  4. Aged or damaged catalytic converter
  5. Faulty downstream oxygen sensor giving wrong readings
  6. Exhaust leak
  7. Overheating of one filter in a dual-DPF system

How to diagnose

  1. Read all codes and freeze-frame data; address any misfire or mixture codes first
  2. Compare bank 2 exhaust temperature sensor data with bank 1 on a scan tool
  3. Check catalyst and filter temperature for plausibility on a warm engine
  4. Compare upstream and downstream oxygen sensor signals
  5. Inspect the exhaust for leaks and damage
  6. Check sensor wiring and connectors for breaks, corrosion or shorts to ground
  7. Check whether regeneration is stuck, and inspect injectors and fuel delivery
  8. Inspect the filter for signs of overheating such as discoloration or deformation

Common fixes

  • Replace a faulty temperature sensor or oxygen sensor
  • Fix the cause of misfires or rich mixture (plugs, injectors, coils)
  • Repair exhaust leaks and damaged wiring
  • Replace a damaged particulate filter or catalytic converter
  • Run a forced regeneration or update ECU software if the manufacturer calls for it

Questions and answers

What does P200F mean?

It means the bank 2 particulate filter overheated. The ECU saw a temperature above the allowed limit and stored the code, often with reduced engine power.

Can I drive with P200F?

Only for a short distance and gently, to a repair shop. Prolonged driving with an overheating filter can destroy it and the catalyst, which makes the repair costlier.

What should I check first?

Start with any misfire or mixture codes, then the temperature and oxygen sensors, then the exhaust for leaks and the condition of the filter itself.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.