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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 04-18-2015, 12:05 AM   #1
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Join Date: Nov 2014
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Hey guys

I'm having a problem with my 2003 bmw m3 Click image for larger version

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My check engine light just came up again..I recently replaced my oem headers with used ones about 6 months ago because my catalytic converters were gone..my car has been sitting for like 2 months I haven't drove it, now the light came back on and my mechanic said the catalytic converter bank 1 has to be replaced again...but I was wondering if they might just be the sensors that are bad

Also another question..how are eBay headers? Would they give me a headache if I install them
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Old 04-18-2015, 05:09 AM   #2
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Clear the codes, drive the car and see if the codes come back. The O2 sensor(s) might have to replaced if the codes comes back.

For ebay headers I'm not sure how it is on M3's but for non-m's O2sim has to be used in most cases.
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Old 04-18-2015, 08:24 AM   #3
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Ebay headers are hit and miss for fitment but generally provide the same amount of gains as any other non stepped header. If you want cats, you can buy them for ~$100-150 usually and then weld them into your section one.
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