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Trying to track down the cause of my 27AF trouble code. The SAP, fuse, and relay all tested ok. Live data from the HFM intake hose sensor also looks good. Freeze frame data shows secondary air mass from lambda bank 1 and average secondary air mass to start at 0 kg/h - does anybody know what sensor this comes from? I recently replaced the bank 1 O2 to resolve code 2740, wondering if the new one is DOA despite no more O2 trouble code.
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