Particulate Filter Pressure Sensor A/B Correlation

Where it lives

For P246D, the part to look at first is the sensor named here.

Check these first

• A pressure sensor A or B that reads out of step with the other
• A restricted pressure hose on one DPF sensor
• A clogged DPF that distorts one pressure reading
• An ECM that misreads the paired sensor signals

What to do next

1. Read pressure sensors A and B on a scan tool at the same time
2. Compare the two sensor readings at key on with the engine off
3. Check both pressure hoses for a blockage or leak
4. Test each sensor circuit for added resistance
5. Replace the sensor that reads out of step with the other
6. Clear the code and retest

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