Have PO 420 & 430 catalysit codes my Boss 302 LS has 3k miles so do not believe it is the cats? Did add some unleaded dracing gas to my fuel as I had some from another car, it is the only thing that is not stock? Anyone else have this issue and solution. Thanks much everyone.
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PO 420 & 430
- Thread startermcgregor32000
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Mad Hatter
Gotta go Faster
It could be the race gas you added was full of that stuff that makes those ugly orange deposits in the engine, but that takes a while to build up.. I would suspect its more likely a problem with your O2 sensors. If the car has been without use and sitting for ages, good bet that the sensors are at fault.
Yes thought that might be the issue but lt gets a few miles a month to a show now and then. It has been trailered to shows before I got it 2nd owner. Any other thoughts help is appreciated.
Thanks much
Thanks much
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