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Friends Jetta is tossing this code: P0420 - Catalyst System, Bank1 Efficiency Below Threshold

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Old 05-10-2007, 10:18 AM
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Default Friends Jetta is tossing this code: P0420 - Catalyst System, Bank1 Efficiency Below Threshold
O2 sensor most likely culprit? No obvious rattles from Cat, and car is still under warranty.

TIA!
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Old 05-10-2007, 10:48 AM
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Bank1 is pre-cat, car is running rich for some reason
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Old 05-10-2007, 10:50 AM
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Is what I thought Evan. We'll clear and try again, see what gives.
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Old 05-10-2007, 11:09 AM
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One of the things that can make it run rich is the coolant temp sensor. Fouled spark plugs can too.
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Old 05-10-2007, 11:22 AM
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Default We'll take it iut for some hot passes. Then check the plugs and CTS>
MANY thanks for all your doings this last w/e Evan!
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Old 05-10-2007, 11:35 AM
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Default Here's another qdm post from b6s4 that i just saw >>>
<a href="https://forums.audiworld.com/s4b6/msgs/401485.phtml">click</a>
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