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Last Updated: September 30, 2026
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Summary
P0436 — Catalyst Temperature Sensor Circuit Range/Performance (Bank 1). P0436 is a medium-severity OBD2 diagnostic ... Have you noticed a rotten egg smell or a sudden drop in fuel economy. In this P0438 — Catalyst Temperature Sensor Circuit High (Bank 1) — excessive voltage si. P0438 is a medium-severity OBD2 ...