The following PDF shows the procedure for replacing the upstream wideband O2 sensor (technically, the LAF, or Lean Air Fuel sensor).
p1157-and-p0134-laf-wideband-o2-sensor-replacement.pdf
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The following PDF shows the procedure for replacing the upstream wideband O2 sensor (technically, the LAF, or Lean Air Fuel sensor).
p1157-and-p0134-laf-wideband-o2-sensor-replacement.pdf