Symptoms
Engine light after cold starts, codes P24C6/P24C7 (particulate matter sensor temperature circuit), and regenerations every 100 miles or so.
The fix, step by step
- One owner of a 2022 D250 replaced the PM temperature sensor, the last sensor in the exhaust after the DPF.
- After a week of cold starts and about 150 miles the light hadn't returned and short-trip regenerations stopped.
- Clear the codes afterwards.
Tools & part numbers
- Sensor socket, penetrating oil, diagnostic tool
- Bosch 0281008520 per Defender2.net (another member cross-references LR146856)
Where to buy the parts
LR146856 particulate matter sensorLR Direct ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Land Rover Defender (L663) parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.