What is trouble code P1812 on an 05 ford explorer mean

SOURCE: 1997 ford explorer V8 5.0 engine

P1405-Differential Pressure Feedback Electronic (DPFE) sensor upstream hose off or plugged - or cracked.

I believe it is on the driver's side of engine about half-way down. also, check all other hoses for damage

SOURCE: Describe your 1996 Ford Explorer Problem..trouble

Diagnostic Trouble Code (DTC) P0443 indicates a failure in the EVAP canister purge valve circuit.
Possible causes:

• VPWR circuit open.
• EVAP canister purge valve circuit open.
• EVAP canister purge valve circuit shorted to PWR GND.
• EVAP canister purge valve circuit shorted to VPWR.
• Damaged EVAP canister purge valve.
• Damaged PCM.

ZJ Limited

• 17989 Answers
• Posted on Oct 05, 2011

SOURCE: my 2005 ford explorer 4x4 xlt (v8 4.6 ltr)has

P2106 is an informational code and is usually set by some other fault.

This DTC means is that the PCM detected a fault with the electronic throttle control and went into fail safe mode. It doesn't tell you specifically what system or component went haywire, just that something was wrong, the PCM didn't know what to do so it went to a known good operating parameter, in this case fail safe mode. Likely is a problem with the TPS sensor and will need to be replaced.

Hope this helps.