Technical Service Bulletins

4Runner A/F DTCs

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4Runner A/F DTCs

Under certain conditions, some 2005-2006 Toyota 4Runner vehicles may exhibit a MIL ON condition with at least one of the following DTCs:

  • P0171 (system too lean, Bank 1)
  • P0174 (system too lean, Bank 1)
  • P2195 (oxygen A/F sensor signal stuck lean, Bank 1, sensor 1)
  • P2197 (oxygen A/F sensor signal stuck lean, Bank 2, sensor 1)

The air-fuel sensor manufacturing process has been improved to correct this condition. Applicable vehicles include 2005-2006 models produced before the following production change VINs:


1GR-FE                         JTEBU1#R#60080374

2UZ-FE                         JTEBT1#R#60058060


Sensor, air fuel ratio……..89467-71020 (new part uses same P/N as new part)


Refer to the Technical Information Service (TIS), 2005-2006 model year 4Runner repair manual: Diagnostics: SFI System (applicable engine): P0171, P0174; or P2195, P2197. Only replace the A/F sensor indicated by the MIL ON DTC(s).

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