Engine warning light on Mazda: causes by model and engine

Documented faults, from most to least important

Severity × frequency. Below each one, the Mazda models it appears in.

- Critical severityFrequency: Common2.3 MZR DISI TurboTiming chain stretch and VVT actuator failure on the 2.3 DISI TurboThe 2.3 DISI Turbo's timing chain and its tensioner wear sooner than expected, especially on pre-2010 units: a rattle when cold is the warning, and if it fails it can damage the engine.Appears at around 100,000 km
In 3 I, 3 II, 6 I and CX-7
- High severityFrequency: Very frequent1.6 HDiTurbo failure through lack of lubrication (carbon deposits and union filter)On the 16-valve 1.6 HDi/TDCi engines (2004-2011) the turbo can seize because carbon deposits from the oil clog the mesh filter in the union that feeds it. It is a serious, repeat fault: if only the turbo is replaced without cleaning the circuit, it fails again.Repair (garage): €700–€1,050
In 3 I
- Medium severityFrequency: Very frequent1.4 HDiInjectors that lose their seal and let diesel escapeThe most cited weak point of the 1.4 HDi is its injectors: over time they can lose their seal and let diesel escape, which is usually noticed as a smell of diesel in the car. It appears in the two most common outputs (68 and 70 hp) and in both cases it is identified as the engine's main weakness.
In 2 I
- Medium severityFrequency: OccasionalSkyactiv-GIntake shut-off valve software issue and engine stallingOn Mazda3 BM/BN units built up to 4 July 2018, incorrect ECU programming can deposit soot on the intake shut-off valve to the point of suddenly stalling the engine; Mazda fixed it with a software update.
In 2 II, 3 III, 6 III, CX-3, CX-5 I and CX-5 II and 1 more model
- Medium severityFrequency: Occasional1.4 HDiEGR valve clogged with carbonThe EGR valve, which recirculates part of the exhaust gases to reduce emissions, can seize or clog up with the carbon those gases carry. It appears in a noticeable minority of the reports collected for the 68 hp version.
In 2 I
- Low severityFrequency: CommonSkyactiv-GCarbon build-up in the intake manifold and injectorsLike almost any direct-injection petrol engine, the Skyactiv-G accumulates carbon on the intake valves over the miles and can foul the injectors, with loss of power and a rough idle; gebrauchtwagenberater.de documents it on the Mazda2, Mazda3, CX-3, CX-30 and CX-5.
In 2 II, 3 III, 3 IV, 6 III, CX-3 and CX-5 I and 3 more models

By Mazda model

Open yours to see only the faults that affect it, by engine and by year.

Engines and gearboxes involved

Frequently asked questions

Engine warning light in a Mazda: what could it be?

In 14 models from Mazda there are 6 documented faults that cause this symptom (engine warning light). The most important: timing chain stretch and VVT actuator failure on the 2.3 DISI Turbo, turbo failure through lack of lubrication (carbon deposits and union filter) and injectors that lose their seal and let diesel escape. Each fault has its own page with the affected years and versions, the cause and how to check for it.

Which Mazda models have the most faults with this symptom?

Mazda 2 I (2 faults), Mazda 3 I (2 faults), Mazda 6 III (2 faults) and Mazda CX-5 I (2 faults).

Which Mazda engines cause it?

1.4 HDi (2 faults), Skyactiv-G (2 faults), 1.6 HDi (1 fault) and 2.3 MZR DISI Turbo (1 fault).