2003-2006 Ford Expedition DTD P0171 P0174 Possible Trouble Areas

 

2007 Honda Civic Si ECU Wiring Diagram

 

2012 Toyota Corolla Catalytic converter and resonator

 

P0505 Idle Air Control System, 2006 Lexus GS300.

You will need a scan tool to know the live data and figure out the problem of this code. I suggest to get it diagnosed at a Toyota/Lexus dealership. Better to spend the diagnosis fee rather than keep replacing parts.

 

CODE 12 Diagnosis Procedure 1994 Toyota Celica 2.2L engine 5S-FE