Thread: I got the P0420 code, had questions about it.
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Old 12-02-2014, 11:43 AM
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THE VEIN THE VEIN is offline
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The p0420 code with not harm your car in anyway it's a code for emissions. When I swapped the stock cat out of my audi for a high flow cat I was getting a p0420 code and I bought a $5 spacer for the o2 sensor and the code went away. You may need just a new o2 sensor or a new cat

If you want a new exhaust it will be cheaper to get it done at a muffler shop
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