Step 1: Press the brake 1 time. Step 2: Switch the ignition on/off 3 times (end with the ignition on). Step 3: Press the brake 1 time. Step 4: Switch the ignition on/off 3 times (end with the ignition on). Now the horn will sound which indicates that the TPMS system is in learning mode. Once in learning mode a Ford TPMS tool is needed. senix. Super Moderator. Join Date: Aug 2008. Location: Frederick, MD. Posts: 36,169. Likes: 12. Received 1,232 Likes on 871 Posts. P2452 Diesel Particulate Filter Pressure Sensor "A" Circuit D* DPFP-A. I beleive it to be the one before the DPF. 8q6L7H.

ford mondeo dpf pressure sensor location