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P0430 WEIRD problem! Help please.

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Old Nov 15, 2014 | 12:03 AM
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algemene
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2007 BMW 335i Convertible/ 2006 CLS 500
P0430 WEIRD problem! Help please.
Okay so a week before my emission test my car was perfectly fine after i changed my right (passenger side) catalytic converter. A couple days after i passed my emissions, check engine light went on. I got P0430 code "Catalyst System Efficiency Below Threshold (Bank 2)". but the problem is...My MPG hasn't dropped badly (i'm getting 16-20MPG at times). Sometimes when I press on the accelerator my MPG drops. What is going on? Can anybody help me?

2003 Mercedes c320 4matic with 140K miles.

which side is bank 2?
Last edited by algemene; Nov 16, 2014 at 01:17 AM.
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Old Nov 15, 2014 | 09:53 PM
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pcy
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'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
While catalytic converter change was done, O2 sensor (after catalytic converter) was either damaged/not reconnected.
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Old Nov 16, 2014 | 01:00 AM
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algemene
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2007 BMW 335i Convertible/ 2006 CLS 500
question. Is bank 2 on the driver side or passenger side? and which cat is that?

my car is left hand drive by the way.
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Old Nov 16, 2014 | 04:57 PM
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'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
Bank 2 is right side (passenger side).
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