p0420 caused by a bad radiator cap
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i think he means the cap was causing a vacuum to occur on cooldown and collapsing his coolant hoses. Dont know how that affects the obd2 system other than delayed warmup or overheat causing the temps to change rapidly and the ecm fueling that the O2 sensors read
Last edited by scottjh9; 08-22-2024 at 12:34 PM.
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Well me neither but since then i have no MIL that's why I came to this conclusion... I drove the car for then till now 300 kilometres in miles I think around 150ish???
Last edited by Markje1978; 08-22-2024 at 01:33 PM.
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Markje1978 (08-23-2024)
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