Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
The diesel particulate filter monitor detected filtration efficiency below its threshold. Filter damage, leakage or incorrect sensor readings can affect this result. This code does not directly measure soot loading or prove the filter is clogged. A shop needs to evaluate filter integrity and the relevant sensor data before choosing a repair. The code refers to bank 1; identify the filter and bank using vehicle documentation.
Can I keep driving?
A code alone cannot establish that driving is safe. With a flashing warning, shaking, overheating, unusual mechanical noise, smoke or substantial power loss, stop safely and arrange assistance. Otherwise ask a repair shop for vehicle-specific advice before driving further.
Flashing light, burning smell or smoke? Pull over safely. Danger to life: call 911.
What does this code mean for your car?
The same code can need different checks depending on the model and engine. Enter your vehicle details to find relevant sources and checks.
Symptoms
- DPF or check engine light
- Power loss / limp mode
- Higher fuel use
Possible causes
- 1Damaged or cracked particulate filter
- 2Exhaust leakage affecting the monitor
- 3Sensor or pressure-line readings that do not reflect filter condition
These possibilities are not ranked by frequency and do not diagnose your vehicle.
Checks you can safely do yourself
Safe checks only: engine off and cold, car on level ground.
- Record DPF warnings and consult the owner manual. Do not attempt forced regeneration, remove the filter or try to clear this fault with hard driving.
When you need a shop
Have a shop identify the bank 1 filter from vehicle documentation and check leaks, filter integrity and sensor data. Do not attempt forced regeneration based on this code alone; smoke, overheating or abnormal power loss calls for a safe stop and assistance.
How much does it cost?
A US repair estimate needs a diagnosis and a local shop quote.
No verified US repair estimate is available. Ask a local shop to diagnose the vehicle before quoting parts and labor.
Get 2-3 quotes
Investigate this code for my carFAQ
Can I keep driving with P2002?
A code alone cannot establish that driving is safe. With a flashing warning, shaking, overheating, unusual mechanical noise, smoke or substantial power loss, stop safely and arrange assistance. Otherwise ask a repair shop for vehicle-specific advice before driving further.
What can cause P2002?
Check filter integrity, exhaust leakage and the measurement system. Soot loading is a separate condition to assess using vehicle data, not assume from this code alone.
If I clear the code, is it fixed?
No. Clearing a code does not repair its cause and may erase diagnostic evidence or reset readiness monitors. It may return when the monitor runs again. An unlit warning does not prove the vehicle is fault-free.
I saw this code on a car I'm thinking of buying - now what?
Don't run, don't shrug it off. Ask the seller for a shop diagnosis before you sign, and use what it finds to negotiate.
How much does fixing P2002 cost?
We do not have a verified US repair quote for your vehicle. Diagnosis, local labor rates and the confirmed repair determine the price. Get 2-3 quotes.