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Low post 02 voltage
I have a truck that came in failing Marta test with a P0420 code and a P0430 code. The truck had three bad 02 sensors so I replaced them and then watched the cats on the scanner. I had activity on cat 2 but cat 1 acted like it wasn't even there. I replaced the... Login to read more. 
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| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1998 Chevrolet K1500 Silverado 5.7L
| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
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