**NEWBIE** engine codes need help...

Discussion in 'SN95 V6 Mustang Tech' started by 2kstangv6, Jul 22, 2011.

  1. I just bought a 2000 mustang 3.8 engine runs strong but alot of codes are coming up. first things first i do know off the top that there is NO EXHAUST header back gone so o2 sensors are defintaly throwing up codes but the guy at oreilly wsnt any help with the rest...

    whats coming up is:

    any and all help and info greatly appreciated!
  2. Any time a lot of DTC codes are thrown the 1st thing to check are fuses. Confirm fuse F2.2 and F2.8 in the CJB (driver's kick panel).

    The codes are basically calling out 3 of the 4 O2 sensors. IMO either there is a wiring fault or there is a huge exhaust leak.

    Start first by inspecting the wiring harness pig tails. Look for evidence of melting from contact with hot exhaust or any other evidence of damage.

    Today's cars simply can not run right with intake or exhaust leaks.

    P0175 - System to Rich (Bank 2)
    P0155 - HO2S Sensor Circuit Malfunction (HO2S-21)
    P0155 - HO2S Sensor Circuit Malfunction (HO2S-21)
    P0161 - HO2S Sensor Circuit Malfunction (HO2S-22)
    P1131 - Lack of HO2S-11 Switch, Sensor Indicates Lean
    P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean
    P0172 - System to Rich (Bank 1)
    P0172 - System to Rich (Bank 1)