P0546 fault code: what it means

P0546: Exhaust gas temperature sensor 1 circuit high.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

open circuit or failed EGT sensor
unplugged connector

P0546 by make

Isuzu

Exhaust gas temperature sensor 1 circuit high.

Usual causes: failed sensor; open wiring

LDV

LDV diesel: exhaust temp sensor 1 circuit high.

Usual causes: sensor; open wiring

Mazda

Exhaust gas temperature sensor No.1 circuit high (diesel). DPF regeneration control is affected.

Usual causes: exhaust gas temperature sensor No.1; open circuit (sensor wiring near hot exhaust)

Mercedes-Benz

Exhaust gas temperature sensor (bank 1 sensor 1) circuit high.

Usual causes: failed exhaust temp sensor; broken wire

Not sure what P0546 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.