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I had a lean code for one bank only. It turned out to be loose bolts attaching the downpipe to the exhaust manifold. I tightened them up and the LT trims returned to a normal range and the lean code did not return.
This part of the exhaust is before the first 02 sensor. It was fooled by air entering the system at the downpipe/manifold. The bolts are easy to reach with a ratchet extension of about 18".
This part of the exhaust is before the first 02 sensor. It was fooled by air entering the system at the downpipe/manifold. The bolts are easy to reach with a ratchet extension of about 18".
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