P0149 Fuel Timing Error — Causes & Fix

What Does P0149 Mean?

P0149 is logged when the ECU cannot achieve or verify its commanded injection timing. Causes range from rail-pressure instability and sensor faults through to worn injectors responding too slowly. It typically appears with hard starting, knock or smoke and warrants a prompt leak-off comparison.

P0149 at a Glance

• What it means: Actual injection timing does not match the timing the ECU commanded.
• Most common cause: Rail pressure sensor fault
• Severity: Moderate to serious — rail-pressure faults cause power loss and non-starts.
• Can you drive?: Short distances in limp mode only. Diagnose promptly.
• Typical repair cost: £40-£150 for sensor/regulator work; £100-£350 per injector where back-leak is the cause.