Reductant System Performance Bank 1

Check these first

• A low DEF level in the tank
• A blocked or restricted reductant delivery line
• A weak reductant pump
• A degraded SCR catalyst

What to do next

1. Check the DEF level and refill as needed
2. Inspect the reductant lines for a blockage
3. Read the reductant pump output on a scan tool
4. Check the SCR catalyst efficiency with a scan tool
5. Repair the pump, line, or catalyst as needed
6. Clear the code and retest

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