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BMW N13 (N13B16)Urgency: Monitor

Increase in fuel consumption in the BMW N13 engine: causes

In the BMW N13 engine, 1 documented fault may be the cause: carbon build-up on direct injection injectors.[1]

What to do now

Monitor

Compare real consumption over successive fill-ups and ask for a diagnosis if the increase is more than 10-15% with no explanation.

What it means

A rise in consumption without any change in use may be caused by faulty injectors, sensors sending wrong data, frequent particulate filter regenerations or a thermostat that stops the engine reaching its operating temperature.

Uses more fuel: causes in all cars

4 sourcesHow we work

Engine faults that cause it

From most to least important. Under each fault, how the symptom shows up. Check the affected years and versions on each page.

  1. Source for the symptom[1]

Other common causes: uses more fuel

Besides the documented faults of the BMW N13, these are the most common causes on any car according to the sources.

  • Under-inflated tyres[2][3][4]Common
  • Change in use: city driving, short journeys, harsh driving[2][3]Common
  • Extra weight, roof rack or roof box, air conditioning[2][3]Common
  • Dirty air filter or overdue maintenance[2][3][4]Possible
  • Dirty or faulty injectors[2][3][4]Possible
  • Lambda sensor and engine management sensors[2][4]Possible

What to check first

  1. Note litres and kilometres between fill-ups (or look at the average consumption on the trip computer) to compare with your own history: GnG considers that comparison more reliable than the official figure.[2]
  2. Measure tyre pressure when cold, with the load and values specified by the manufacturer; it is the cheapest check and, according to GnG and Veiko, one of the most frequent causes.[2][3]
  3. Remove whatever isn't needed: roof rack, roof box, bike carrier or weight in the boot, and look at your air conditioning use and the way you drive.[2][3][4]
  4. Check that the filters (air, fuel), the oil and the spark plugs, on engines that have them, are up to date according to the manufacturer's schedule.[2][3]
Complete guide: increase in fuel consumption

Cars with the BMW N13 engine

Open yours to see only the faults that affect it according to its years and versions.

Frequently asked questions

Uses more fuel in the BMW N13: what could it be?

In the BMW N13 engine, 1 documented fault may be the cause: carbon build-up on direct injection injectors. Each fault has its own page with the affected years and versions, the cause and how to check for it.

Uses more fuel in the BMW N13: is it serious?

Urgency: monitor. Compare real consumption over successive fill-ups and ask for a diagnosis if the increase is more than 10-15% with no explanation. The most serious fault that causes it on this engine has low severity.

Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. Tickende Zeitbombe: So zuverlässig ist der Prince-Motor von PSA und BMWGebrauchtwagenberater.de · Motoring press · published 13 March 2026 · consulted 27 September 2026 · in German
  2. ¿Por qué mi coche consume más combustible? 7 causas que deberías revisarGnG · Other source · published 17 September 2026 · consulted 29 October 2026 · in Spanish
  3. ¿Por qué mi coche tiene un consumo más elevado de lo normal?Veiko · Other source · published 14 August 2025 · consulted 29 October 2026 · in Spanish
  4. 8 razones por las que tu coche consume más combustible de lo normalElectromecánica Araujo · Other source · consulted 29 October 2026 · in Spanish