Your catalytic converter on Bank 1 isn't getting hot enough to work properly, like an engine that won't warm up to operating temperature. The ECU detected the heated catalyst temperature sensor reading below the minimum threshold needed for the converter to function effectively.
The ECU monitors the heated catalyst temperature sensor (typically a thermocouple or resistance-based sensor) located in or near the catalytic converter on Bank 1. The sensor must reach a minimum operating temperature threshold, usually around 370-400°C, for the converter to efficiently reduce emissions. If the reading stays below this threshold for a set duration, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Catalyst Temperature | 370-900°C during operation | Below 370°C for extended period |
| Sensor Response Time | Reaches threshold within 30-60 seconds of startup | Fails to reach threshold or responds slowly |