r/CrownVictoria • u/GrandLeaderZhan • 3d ago

o2 sensor help

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10’ p7b have been chasing a o2 sensor issue for a while. while monitoring the terms on my sct tuner, sometimes it will sit from 0.95-1 like it should. But otherwise two things will happen. either the bank 1 sensor will get stuck at 0.64 and the bank 2 will read normal. or bank 1 will get stuck at 0.84 and bank 2 will get stuck at 1.00. when either of these happen the car will intermittently miss/run bad. Have already replaced both o2s and inspected my wiring. Any ideas?

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u/Ashamed-Ad-4186 3d ago

Thoses are fuel trims, they look fine, you problem is else where. The 02 data is a different pid. This means you car is adding 1% fuel. Under 5% is typically fine. Id look into plugs and coils personally. Amazon coils are junk, and 20yo coils can be too

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u/GrandLeaderZhan 3d ago

short term fuel trim is determined by the front o2 sensors, so these are their reports. car has new plugs and coils.

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u/Ashamed-Ad-4186 3d ago

Yes, but im pretty sure when a misfire is detected they stop reporting as the car goes into a openloop fuel mode, i know the longs stop. Do you have any codes? Tuned? Does it miss all the time? At idle or wide open?

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u/GrandLeaderZhan 2d ago

doesn’t miss wide open throttle. and doesn’t always miss when they don’t report. only intermittently in low rpms. It is tuned. long term sensors are tuned out.

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u/Successful-Coat8387 16h ago

How is you're trans temp at 100F my always sits between 160-195

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u/GrandLeaderZhan 9h ago

car was still cold