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03 4Runner 4.7 Check engine light

Discussion in '4th Gen 4Runners (2003-2009)' started by Tio517#, Aug 25, 2025 at 12:37 PM.

  1. Aug 25, 2025 at 12:37 PM
    #1
    Tio517#

    #1
    Tio517# [OP] New Member

    Joined:
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    Vehicle:
    03 4Runner 4.7
    Chasing down lean condition bank 2
     
    Tio517#, Aug 25, 2025 at 12:37 PM
    #1
  2. Aug 25, 2025 at 1:16 PM
    #2
    JET4

    #2
    JET4 Old Member

    Joined:
    Dec 20, 2018
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    Southeast, Va.
    Welcome
     
    JET4, Aug 25, 2025 at 1:16 PM
    #2
  3. Aug 25, 2025 at 4:49 PM
    #3
    BS67

    #3
    BS67 8404 USMC Doc

    Joined:
    Jan 26, 2024
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    Welcome
     
    BS67, Aug 25, 2025 at 4:49 PM
    #3
  4. Aug 27, 2025 at 12:58 PM
    #4
    3JOH22A

    #4
    3JOH22A トヨタ純正男娼

    Joined:
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    5G 4Runner, 3G Tacoma on 35"s
    Lean means the upstream AF sensor is detecting more air than expected. Exhaust manifold leak on the passenger side perhaps? It's a common 4.7L problem (the "not if, but when" type)
     
    3JOH22A, Aug 27, 2025 at 12:58 PM
    #4
    icebear likes this.
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