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Old 01-02-2013, 01:24 PM   #1 (permalink)
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Catalytic Converter Replacements

All,

I have a 2003 MDX that is currently throwing two codes, p0240 and p0430.

The dealer mentioned that both my catalytic converters have gone bad and will need replacing for the MDX to pass inspection.

I looked at OEMAcuraParts at this list and found one converter.

2 18160-RCA-A00 CONVERTER1 1 $332.94 $246.38

I was told that two converters need replacing. Would I purchase two of these or am I missing something.
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2003 MDX Base Silver 142K Miles{
235/65R17 Bridgestone Dueler H/L Alenza,
2004+ Headlights with H9 Bulb Conversion,
Fog Lights equipped with 9012 Bulb Conversion
iPOD Aux hookup to Stock Radio,
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1991 Acura NSX Silver 31K Miles{
Escort 8500 X50,
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Old 01-02-2013, 03:46 PM   #2 (permalink)
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after more research they want to replace all the o2 sensors and catalytic's. I would assume that everything would not fail at once. Perhaps replacing the four o2 sensors first will be less expensive.
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2003 MDX Base Silver 142K Miles{
235/65R17 Bridgestone Dueler H/L Alenza,
2004+ Headlights with H9 Bulb Conversion,
Fog Lights equipped with 9012 Bulb Conversion
iPOD Aux hookup to Stock Radio,
Trunk Pet Net}

1991 Acura NSX Silver 31K Miles{
Escort 8500 X50,
K&N Intake
}
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Old 01-02-2013, 05:24 PM   #3 (permalink)
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Same problem here, I have a 2004, but only the back one is bad, so thanks for posting this question, I hope to DIY Since the dealership wants $750 or I may just go with Pre Cat Deletes.
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Old 01-02-2013, 06:29 PM   #4 (permalink)
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^^I think that you referenced the front converter, you will also need the rear primary one, look CONVERTER, RR. PRIMARY for 2003 ACURA MDX|18290-RCA-L00. I recently ordered this for a friend of mine.
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Old 01-02-2013, 08:00 PM   #5 (permalink)
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Thanks for the response. Turns out the light went out. Seems that the temperature activates the sensor.

Should I look out for any further issues? Is there an easy way to find the culprit.
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2003 MDX Base Silver 142K Miles{
235/65R17 Bridgestone Dueler H/L Alenza,
2004+ Headlights with H9 Bulb Conversion,
Fog Lights equipped with 9012 Bulb Conversion
iPOD Aux hookup to Stock Radio,
Trunk Pet Net}

1991 Acura NSX Silver 31K Miles{
Escort 8500 X50,
K&N Intake
}
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Old 01-03-2013, 06:18 AM   #6 (permalink)
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If the light comes back on and the same code, then most likely the converter is going bad
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Old 01-03-2013, 09:24 AM   #7 (permalink)
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The codes were p0420 and p0430. Not 240.
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2003 MDX Base Silver 142K Miles{
235/65R17 Bridgestone Dueler H/L Alenza,
2004+ Headlights with H9 Bulb Conversion,
Fog Lights equipped with 9012 Bulb Conversion
iPOD Aux hookup to Stock Radio,
Trunk Pet Net}

1991 Acura NSX Silver 31K Miles{
Escort 8500 X50,
K&N Intake
}
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Old 09-01-2014, 10:03 PM   #8 (permalink)
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What are the effects of a failed catalytic converter? Can the car stall, do toxic emissions increase, etc?
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Old 09-02-2014, 12:26 PM   #9 (permalink)
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IIRC a noticible drop in MPG. Terrible smell. Low RPMs and sometimes the engine stalling.
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