Air intakeGeneric OBD-II codeUrgency: Monitor

P0507 on Mazda: causes and affected engines

P0507 means: idle control system: speed higher than expected.^[1][2] Mazda has 4 documented faults that can trigger it, across 4 engines: 1.6 HDi, MZR-CD, Skyactiv-D and Skyactiv-G. Only a diagnosis can confirm the cause on your car.

Documented faults

that can trigger it

Engines

used by Mazda, with at least one of them

Mazda models

with at least one of these faults

Urgency

Monitor

Reviewed on 29 October 20263 sources How we work

Documented faults in Mazda engines that can trigger P0507

Grouped by engine or model, from most to least important. These are faults with carbon build-up in the intake and with the intake flaps: not all of them will necessarily set the code, and only a diagnosis confirms the cause on your car.

1.6 HDi

In 3 I

- Medium severityFrequency: CommonInjectionLeaks at the injector washers and carbon build-up in the cylinder headIt is common for the copper washers of the 1.6 HDi injectors to stop sealing: the engine blows gases, carbon forms around the injector and soot gets into the oil. It is cheap to repair, but if left it contaminates the oil and is one of the causes of turbo failure.Repair (garage): €110–€310

MZR-CD

In 3 I, 3 II, 5 I, 6 I, 6 II and CX-7

- Medium severityFrequency: CommonIntakeCarbon on the injectors, EGR valve and intakeUrban use and short journeys encourage carbon to build up on the injectors, EGR valve and intake of the MZR-CD, with loss of power and jerking; documented on the Mazda6 and Mazda3, on both the 2.0 and the 2.2.

Skyactiv-D

In 3 III, 3 IV, 6 III, CX-3, CX-5 I, CX-5 II and CX-30

- Medium severityFrequency: CommonIntakeCarbon build-up in the intake, EGR and injectorsUrban use and short journeys encourage carbon build-up in the intake manifold, EGR valve and injectors of the Skyactiv-D, with loss of power and uneven running; it is documented on the CX-5, the Mazda6, the Mazda3, the CX-3 and the CX-30.

Skyactiv-G

In 2 II, 3 III, 3 IV, 6 III, CX-3, CX-5 I and 3 more models

- Low severityFrequency: CommonIntakeCarbon 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.

Common causes of P0507 on any make

From most to least likely, according to the sources.

1Vacuum leak or unmetered air entering after the throttle: cracked intake hose, PCV or brake servo hose, or manifold gasket.^[1][3]
2Throttle body dirty or sticking from carbon build-up, or idle air control (IAC) valve stuck open.^[1][2][3]
3Dirty mass airflow (MAF) sensor or incorrect coolant temperature signal.^[2][3]
4EVAP purge valve stuck open, letting vapours into the intake.^[1]

What to check first

The first diagnostic steps, from the most likely and cheapest to check to the most expensive.

1Use the diagnostic tool to check that the idle really is higher than the target and when it happens: cold, warm or with the air conditioning on.^[1]
2Look for unmetered air leaks with a smoke test on the intake: hoses, PCV, brake servo, gaskets and EGR.^[1][3]
3Clean the throttle body and the IAC valve, and carry out the throttle relearn with the tool if it is electronic.^[1][3]

Full guide to P0507: symptoms, diagnosis and whether you can drive

Frequently asked questions

Which Mazda engines have faults that can trigger P0507?

1.6 HDi (1 fault), MZR-CD (1 fault), Skyactiv-D (1 fault) and Skyactiv-G (1 fault). Each fault has its own page with the affected years and versions, the symptoms and the repair cost.

What does code P0507 mean on a Mazda?

Idle control system: speed higher than expected. The ECU has detected that the actual idle speed is consistently above the target it calculated itself, with a tolerance that AutoDTCs puts at around 200 rpm. It is a generic OBD-II code: it means the same on a Mazda as on any other make.^[1][2]

Can I keep driving with P0507?

Monitor. According to the sources it will not leave you stranded, but a high idle raises consumption and can punish the automatic gearbox when engaging; get it repaired soon.^[1][3]

Sources

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

P0507 – AutoDTCsAutoDTCs · Technical documentation · consulted 29 October 2026
OBD Fehlercode P0507CarWiki.de · Technical documentation · consulted 29 October 2026 · in German
P0507: OBD2 diagnostic trouble codeCarista · Technical documentation · consulted 29 October 2026