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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > N52: catalytic convertor bad says INPA



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      01-31-2017, 11:08 AM   #1
Meeni
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N52: catalytic convertor bad says INPA

I got the following error in INPA: 0x29F4, 0x29F5

Both relate to the catalytic convertor being inefficient.

I am running the stock exhaust on an N52. Gas mileage is poor (19-20 mpg mixed). All O2 sensors are original (but do not report -other- codes). Engine drivability is fine.

What is your opinion ? Bad cat? bad O2 sensors? Air leak? Something else?
Any other page could help diagnose ?
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      02-06-2017, 07:40 PM   #2
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      02-07-2017, 08:55 AM   #3
robthewrench
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If you put the car through an emissions test to the get CO, NOX, and hydrocarbon levels that might give you more information about whether the cat or the O2 sensor is failing. The O2 sensor should be a separate error.

It is very possible your cat has failed and is partially clogged. The poor fuel mileage with an O2 sensor error points in this direction. The car should be comparing the pre cat 02 sensors to the post cat 02 sensors to determine the efficiency of the cat.
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