136 error code lean HO2 sensor?

Tiny
EVANDER GAMBLE
  • MEMBER
  • 1994 FORD CROWN VICTORIA
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 144,188 MILES
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.
Wednesday, December 20th, 2023 AT 8:44 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,097 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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Wednesday, December 20th, 2023 AT 9:49 PM

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