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P2002: Diesel particulate filter efficiency below threshold (Bank 1)
Fix soonSystem: Emissions
What P2002 means
The diesel particulate filter is clogged or not trapping soot as it should. Long motorway drives sometimes help it clean itself.
Common symptoms
- Loss of power
- Black smoke or sooty exhaust
- Stuck in one gear or reduced power mode
Common causes
- Clogged diesel particulate filter
- Exhaust leak near the sensor
- Faulty or worn oxygen sensor
Can I keep driving?
Fix soon. Usually drivable for a short time, but get it checked soon. Ignoring it can waste fuel, raise emissions and lead to more damage.
What to do next
- Write down the code and any symptoms you notice.
- Check the simple things first: the fuel cap, loose connectors and fluid levels where they apply.
- Do not just clear the code. If the light comes back, the cause is still there and needs a proper diagnosis.
- Read live data and freeze frame data with an OBD-II scanner app to see what the car was doing when the code was set.
Read P2002 from your own car
DriveHub connects to a $15 to $30 OBD-II adapter, reads the code from your car and explains it in plain English. iPhone and Android.
General information, not a diagnosis. Causes vary by make, model and engine. If you are unsure, have the car inspected.