136 error code lean HO2 sensor?

1994 FORD CROWN VICTORIA
144,188 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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EVANDER GAMBLE
  • MEMBER
  • 37 POSTS
Okay, so, recently I changed out the catalytic converter on the left side of my vehicle because it was burnt to a crisp. It affected the O2 sensor, so after being replaced it kept giving me the same engine code. I know the right Cat was good, so I only replaced the left. But does that mean I should replace both O2 sensors on each side? I also disconnected the battery to hard reset ECM, but there was no luck.
Dec 20, 2023 at 8:44 AM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

The code indicates the heated O2 sensor isn't reacting in a manner considered to be normal. Additionally, it indicates a lean fuel mixture on that side of the engine. See pic 1 below

The most common cause of this type of issue (only one side has a lean mixture) is an exhaust leak pre-catalytic converter. By chance, are there any exhaust leaks?

Let me know.

Joe

See pic below.
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Dec 20, 2023 at 9:49 PM
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