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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 10-29-2004, 01:18 PM   #1 (permalink)
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My Check Engine light came on and the code says:
P0420 "Cat. System below threshold in bank 1 (Bank 1 identifies the location of cylinder #1, while bank 2 identifies the cylinder of the opposite bank)"
Well I suppose that the Cat might be getting clogged up so I'll check that.

But what does this mean: (Bank 1 identifies the location of cylinder #1, while bank 2 identifies the cylinder of the opposite bank)
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Old 10-29-2004, 01:18 PM   #2 (permalink)
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what does "bank" mean?
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Old 10-30-2004, 02:37 PM   #3 (permalink)
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Anybody?
help plz!!!!!
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Old 10-30-2004, 08:58 PM   #4 (permalink)
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Sounds like your cats are old... either that.. or your O2 sensor is getting erroneous readings.... Replace them...

Good Luck

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