CEL Codes: P0135 & P0161
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CEL Codes: P0135 & P0161
I had LT headers installed on my 2004 E55 and now my CEL is on. The corresponding codes are P0135 and P0161. I've replaced the spark plugs and corresponding O2 sensors (Bosch 16353 and Bosch 13782) and can't get CEL to go off. Any help would be great.