What causes a P1705 code?

P1705 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 P1705 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1705 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

P1705

O2SRD Lambda sensor model dynamic response low fault

What it means

The Engine Control Module (ECM) has detected that the O2 (Lambda) sensor is reacting too slowly to changes in exhaust gas composition compared to the expected software model.