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P0545 fault code: what it means

P0545: Exhaust gas temperature sensor 1 circuit low.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. failed EGT sensor
  2. wiring shorted to earth

P0545 by make

Isuzu

Exhaust gas temperature sensor 1 circuit low.

Usual causes: failed sensor; wiring short

LDV

LDV diesel: exhaust temp sensor 1 circuit low.

Usual causes: sensor; wiring

Mazda

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

Usual causes: exhaust gas temperature sensor No.1; wiring shorted to ground

Toyota

Exhaust gas temperature sensor 1 circuit low on a D-4D diesel. DPF regeneration may be blocked.

Usual causes: failed EGT sensor; EGT sensor wiring damaged by heat

Not sure what P0545 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.