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Toyota P0420
I need some help in understanding what my scanner is showing me. The MIL light was on and code P0420, catalyst system efficiency below threshold, was stored. The freeze frame showed that it was in closed loop, coolant temp was 196 deg F, intake air temp was 55... Login to read more. 
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| Engine | 3.4 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2001 Toyota 4Runner Limited 3.4L
| Engine | 3.4 L |
| Trans | 4-speed Automatic (Electronic) |
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