What causes a P113A code?

P113A can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P113A code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P113A active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P113A

WRAF heater control test fault

What it means

The ECM has detected an electrical malfunction in the heater control circuit of the primary oxygen (WRAF) sensor, meaning the sensor cannot reach its operating temperature quickly enough or maintain it.