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P1116 fault code: what it means

P1116: Honda ECT sensor 1 performance problem: coolant reading not changing as expected. Often thermostat or sensor.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. ECT sensor 1
  2. thermostat stuck
  3. wiring fault

P1116 by make

Honda

Honda ECT sensor 1 performance problem: coolant reading not changing as expected. Often thermostat or sensor.

Usual causes: ECT sensor 1; thermostat stuck; wiring fault

Not sure what P1116 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.