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Got this at almost 24K miles. Dealership repaired under extended warranty. Problem is resolved for now. Here's what the dealership did:
"Verified customer concern, P0019 stored in ECM. Inspected OSV angles for bank 2 sensor B, camshaft correlation. Cleared ECM for code, performed road test 1, with engine speed between 2500-3000rpm for 40 seconds. Decelerated without shifting after 40mph. Checked for DTC P0019. Inspect OSV angles bank 1 and bank 2 exhaust side slow response. Recommend engine oil flush and replacement of exhaust oil control solenoid valve bank 2 and recheck system. Performed engine oil flush, replaced engine oil and filter. Road tested vehicle, OSV angles out of spec. Replaced oil control solenoid valve on exhaust bank 2. Road tested vehicle, OSV angles within normal specifications. Performed extended road test to set monitors. Repair complete."
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