Quote:
Originally Posted by CO4x499
Like the title says. I swapped my battery and it started throwing these codes:
P0171 -System too Lean (A/F Lean, Bank 1)
Secondary DTCs-
P0101 - Mass or Volume Air Flow Circuit Range/Performance
P0138 - Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2
I replaced the MAF, PCV, cleaned the intake throttle body. The mechanic said I need to replace my front/back O2 sensors and that my cats were fine. I live in CO so I need them to pass emissions (year away).
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Listen to your mechanic and replace the O2 sensors before assuming it's the cats.
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2003 4Runner Limited 4wd V8 - Build thread on Tacoma World
FJ tcase swap, VVT intake swap, Solid Offroad motor mounts, Doug Thorley y-pipe, Bold Performance cat-back, ADS shocks F&R, Metal Tech LTHD springs rear, 1" body lift, 285/75/17 Toyo R/T Trails on Sequoia rims, Coastal front bumper, CAD rear bumper
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