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Old 01-09-2012, 11:40 AM
CF Beginner
Join Date: Dec 2011
Location: North Carolina
Posts: 13
Default Catalytic converter Oxygen sensor bank2 PO430

Hello Chevy Fam, I recently had my engine light checked out and the code that the computer came up with was: PO430, Catalytic Converter Oxygen sensor bank 2.

I wanted to know is this something I can do myself or I need to take my truck in for servicing
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Old 01-09-2012, 02:48 PM
CF Junior Member
Join Date: Nov 2011
Posts: 35

This may give you some answers.OBD-II Trouble Code: P0430 Catalyst Efficiency Below Threshold (Bank 2)
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Old 01-24-2012, 04:09 PM
CF Beginner
Join Date: Dec 2011
Location: North Carolina
Posts: 13

Thanks that was some good info, but I need to now how to check the sensors and witch side of the engine is bank 2 I have a Vortec 5.3 2008 Silverado
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Old 01-24-2012, 06:40 PM
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Join Date: Nov 2011
Posts: 35

Bank 2 is the passengers side. That code would be for the one after the Cat. You need to test it with a mulimeter or scan tool. Here's the readings
------------------Idle -----------Full Rich/Lean
Front -----------0.2-0.8 V -----R-0.9/L-0.1 V
After Catalyst -0.4-0.8 V -----Cruise-0.4-0.8 V
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Old 01-24-2012, 08:40 PM
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Join Date: Nov 2008
Location: Bowie, MD
Posts: 2,955

You need to replace the converter 99% of the time the cat is bad. The code po430 does not say anything about o2 sensor. The correct code definition is catalyst efficiency below threshold bank 2. How many miles are on the truck. The converters are covered under the federal emissions warranty 8 years or 80,000 miles. It is mandated by the federal government the dealer can not refuse unless you have modified the exhaust or the engine.
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Old 01-24-2012, 08:40 PM

430, bank, bank2, catalytic, catylitic, chevy, code, converter, efficiency, oxygen, po430, post, problem, sensor, threshold

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