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P2096 — Post-Cat Trim Lean (Bank 1)

P2096 is set when the secondary (post-catalyst) fuel trim on Bank 1 goes more lean than the calibrated limit allows. The downstream O2 sensor's main job is monitoring the catalyst, but it also provides a slow correction layer on top of upstream-sensor closed loop. When that secondary trim has to add fuel beyond its limit to maintain the catalyst's optimal operating point, P2096 sets. The cause is almost always an exhaust leak between the catalyst and the downstream sensor, or unburned fuel residue in the catalyst.

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