P2030 fault code: Fuel Fired Heater Performance Medium severity

P2030 means “Fuel Fired Heater Performance” — a fuel, air & emissions (extended range) fault in the powertrain. Generally driveable, but book the diagnosis before your MOT is due — emissions faults rarely fix themselves. Typical UK repair cost: £20–£1200 depending on the underlying cause.
MediumSeverity
P20xxFuel, Air & Emissions (extended range)
£20–1200Typical UK repair cost
MOT fail riskif the warning light stays on

What does P2030 mean?

P2030 is a powertrain code from the extended SAE range reported by your car’s engine control unit. It sits in the P20xx block, which covers fuel, air & emissions (extended range). The stored description is “Fuel Fired Heater Performance”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed, which is why a short diagnosis pays for itself before replacing components.

Symptoms you may notice

  • Engine management light on with no obvious driveability change
  • Sulphur (rotten egg) smell from the exhaust
  • Failed MOT emissions test

Most common causes

  1. Catalytic converter efficiency below threshold (ageing or contamination)
  2. Failed oxygen (lambda) sensor giving false readings
  3. Exhaust leaks before or after the catalytic converter
  4. EGR valve stuck or clogged with carbon
  5. EVAP system leaks — often just a loose fuel cap

How to diagnose P2030 yourself

  1. Check the fuel filler cap seals and clicks shut (fixes many EVAP codes for free)
  2. Scan live oxygen sensor data — a lazy downstream sensor mimics catalyst failure
  3. Inspect the exhaust for leaks, rattles or corrosion
  4. For EGR codes, remove and clean the valve before replacing it
  5. Only replace the catalytic converter after ruling out sensors and leaks
Tools that read and clear P2030

A basic code reader confirms the fault; a full-system scanner shows the live data you need for the steps above.

Will P2030 fail an MOT?

This family is the classic MOT emissions failure. Since 2018, a stored emissions fault with the light on is a Major defect, and a worn catalyst usually fails the tailpipe test outright.

Before booking your test, check what usually fails on your car: see our MOT pass rates by make and model, built from 33.1 million DVSA tests.

Typical UK repair costs

OutcomeTypical cost (parts + labour)
DIY: read code + basic checks£0 (scanner assumed)
Independent garage diagnosis£30–£60
Typical repair range for this fault£20–£1200
Main dealer equivalent£30–£2160

Costs are indicative UK ranges for independent garages in 2026. Main dealers typically charge 40–80% more.

Diagnose the symptom, then price the repair

Car diagnostic test cost UK (2026): scan vs actual diagnosis£40–£100 is typical for an independent first assessment — but a code read is not the same as finding the cause.
P2000NOx Trap Efficiency Below Threshold P2001NOx Trap Efficiency Below Threshold P2002Particulate Trap Efficiency Below Threshold P2003Particulate Trap Efficiency Below Threshold P2004Intake Manifold Runner Control Stuck Open P2005Intake Manifold Runner Control Stuck Open P2006Intake Manifold Runner Control Stuck Closed P2007Intake Manifold Runner Control Stuck Closed

P2030 — quick answers

Is it safe to drive with P2030?

Generally driveable, but book the diagnosis before your MOT is due — emissions faults rarely fix themselves.

Will P2030 clear itself?

If the underlying fault stops occurring, most ECUs extinguish the light after around 40 healthy warm-up cycles — but the code stays stored as history. Fix the cause, clear it with a scanner, then confirm it stays away over a full drive cycle.

How much does it cost to fix P2030 in the UK?

Typically £20–£1200 at an independent garage depending on which cause you confirm. Diagnosing it yourself with a scanner avoids a £30–£60 diagnostic fee and stops parts being replaced on guesswork.

Will P2030 fail my MOT?

This family is the classic MOT emissions failure. Since 2018, a stored emissions fault with the light on is a Major defect, and a worn catalyst usually fails the tailpipe test outright.

Code definitions follow the SAE J2012 standard. MOT defect rules reflect the DVSA MOT inspection manual (2026). This page is general guidance for UK drivers, not a substitute for a professional diagnosis.