P1491 fault code: what it means

P1491: Honda code: EGR valve lift insufficient. On older Honda V6 (e.g. 1998-2001 Accord V6) it often comes with P0401 from a clogged EGR port.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

carbon-blocked EGR port in intake manifold
faulty EGR valve (internal position sensor)

P1491 by make

Honda

Honda code: EGR valve lift insufficient. On older Honda V6 (e.g. 1998-2001 Accord V6) it often comes with P0401 from a clogged EGR port.

Usual causes: carbon-blocked EGR port in intake manifold; faulty EGR valve (internal position sensor)

Subaru

Subaru code: PCV (crankcase breather) system function problem.

Usual causes: disconnected, split or perished PCV hose; clogged PCV valve; vacuum leak in the PCV system

What the repair usually costs

PCV valve / oil separator replacementNZ$110–NZ$920 · A$110–A$900
EGR valve replacement or cleanNZ$350–NZ$1,710 · A$330–A$1,630

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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.