Need help with check engine light!!!!

[Eddie7644]

To start this all off I have had a check engine light on forever. The scan code came up as a bank 1 #2 o2 sensor reading stuck in low circuit. I replaced the o2 sensor. Then it came back on for catalyst below efficiency and more o2 codes. So I gutted my cats. Now my #2 sensors keep swapping back and forth throwing low circuit codes. I have absolutey no clue what to do now. The o2 sensors were on non fowlers then I took them off then put them back on then doubled them up lol. I tried everything. What does somebody think?

 

[drowssap]

Spray water all around your intake manifold and see if the engine stumbles.

 

[MINIz guy]

Throw up the exact OBD2 codes you're seeing.

If you gutting the cats, it makes sense you're seeing catalyst inefficiency codes.

 

[swathdiver]

Are your upstream sensors a different part number than your downstream sensors? Do the sensors have more than 100,000 miles on them?

Once you gutted the cats, you now need a tune to turn off those downstream sensors to keep them from throwing codes. Black Bear can do this and you'll enjoy the extra usable horsepower.

While I have not tried it on mine, I would imaging that if one swapped a downstream sensor for an upstream that it would throw a code as they are different in some way. Even if this is so and you get the sensors back where they belong, you'll still need a tune to turn them off. If the sensors are old, replace with new ones.

Do you have access to a Tech2 or a good scan tool? Such a one can allow you to read numerous parameters so you can see how your motor is running and of course allow you to clear those codes.

 

[Searay45db]

Leaking manifold....not uncommon.