P0420 Stoner code and it's not what you think it is...
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Pretty Darn Active Enthusiast
Joined: Mar 2019
Posts: 374
P0420 Stoner code and it's not what you think it is...
looks like something went bad
the O2 reading 0.00 volts at idle (randomly hits 0.00) in Closed loop and has a stoner code p0420
Long Term fuel trims when the code was stored was +32% on both banks
it's on the AFM bank on cylinders
sensor #2 is NOT tracking sensor 1 on both banks
Bank 1 sensor 1 shows 0.00 volts @ idle and gives a P0420 Code
bank 2 sensor 1 show 0.05 volts @ idle
sensor 1 = pre cat
sensor 2 = post cat
the cat temperature is fine 480-550C and is tracking the throttle/fuel input like it should... sometimes the engine will stumble because of it at idle
the O2 reading 0.00 volts at idle (randomly hits 0.00) in Closed loop and has a stoner code p0420
Long Term fuel trims when the code was stored was +32% on both banks
it's on the AFM bank on cylinders
sensor #2 is NOT tracking sensor 1 on both banks
Bank 1 sensor 1 shows 0.00 volts @ idle and gives a P0420 Code
bank 2 sensor 1 show 0.05 volts @ idle
sensor 1 = pre cat
sensor 2 = post cat
the cat temperature is fine 480-550C and is tracking the throttle/fuel input like it should... sometimes the engine will stumble because of it at idle
Last edited by Tahoe_08; Oct 2, 2019 at 05:54 AM.
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