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P0327 fault code: what it means

P0327: Knock sensor 1 signal is too low.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. failed knock sensor
  2. damaged wiring or chafed harness
  3. loose or corroded connector
  4. sensor bolt not torqued correctly

P0327 by make

Subaru

Knock sensor circuit reads low. The ECU pulls timing back, so power and economy drop.

Usual causes: faulty knock sensor; knock sensor connector or wiring fault; sensor not tightened correctly

Suzuki

Knock sensor circuit low.

Usual causes: faulty knock sensor; wiring or connector

Not sure what P0327 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.