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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 07-12-2013, 10:35 AM   #1 (permalink)
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Engine Codes P0420

I looked up what code means, "Catalyst System Efficiency Below threshold" , how do I go about fixing issue or is it something need garage to do? novice at best when working on vehicles!!
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Old 07-12-2013, 08:44 PM   #2 (permalink)
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Old 07-12-2013, 11:12 PM   #3 (permalink)
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Originally Posted by bear328i View Post
I looked up what code means, "Catalyst System Efficiency Below threshold" , how do I go about fixing issue or is it something need garage to do? novice at best when working on vehicles!!
It means either your O2 sensor has failed and is not correctley measuring the appropriate air/fuel ratio, or that your Catalytic Converter (cats) have failed and will need replacing. If your a novice then this will be something that you should have a shop do properly. This will require the vehicle to be on a hoist to have the exhaust removed (if it is the cats).


Please note, the reason that new cats are so bloody expensive is because they contain several precious metals including Platinum. Platinum is 3 times more expensive then gold by weight so keep this in mind when they drop the price of them on you.
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Old 07-29-2013, 03:04 PM   #4 (permalink)
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p 0420 = Replace cats! (or gut and simulate)
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