P0507: How to Diagnose & Fix — Idle Air Control System RPM Higher Than Expected
18 vehicles · 13 makes · $20-$2,200 repair
How to diagnose and fix P0507: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Volvo S60 · 2019–2023
The positive crankcase ventilation (PCV) system oil trap on the S60 T5 and T6 engines fails prematurely, causing excessive crankcase pressure, oil leaks, and increased oil consumption. The oil trap membrane hardens and cracks, allowing oil mist to enter the intake manifold and be burned in combustion. Failed PCV systems also cause boost leaks and rough idle. The oil trap is integrated into the valve cover on these engines, making replacement more expensive than older designs with external PCV valves. Volvo updated the oil trap design in mid-2022 production.
Common Symptoms
- Excessive oil consumption (1 qt per 2,000-3,000 miles)
- Rough idle and occasional misfires
- Oil leak from valve cover area
- Whistling noise from engine bay (boost leak through PCV)
- Check engine light with codes P0171 (lean), P0507 (idle speed high)
How to Fix
Replace the PCV oil trap assembly, which is integrated into the valve cover on these engines (Volvo part 31338685 for oil trap, or 31375560 for complete updated valve cover assembly). Clean intake manifold of oil deposits. Replace spark plugs if fouled. Use Volvo-approved 0W-20 oil and shorten oil change intervals to 5,000 miles. Updated oil trap design from mid-2022+ should be used as replacement part.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Volvo 32140004 Drive-E four-cylinder oil trap
replace a diagnosed failed crankcase oil-trap assembly Fitment/availability: Applicable non-mild-hybrid Volvo Drive-E four-cylinder S60 gasoline and plug-in-hybrid branches; confirm VIN, engine code and installed part number, and do not …
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Chevrolet Sonic · 2012–2020
The 1.4L turbocharged Ecotec engine in the Sonic shares the notorious PCV system failure with the Chevrolet Cruze. The PCV regulator diaphragm integrated into the valve cover ruptures, causing massive vacuum leaks. Additionally, the intake manifold check valve (small red/orange valve) fails, compounding the issue. This affects virtually all 1.4T Sonics eventually, typically between 50,000-100,000 miles.
Common Symptoms
- Check engine light with P0171 (system too lean)
- Rough or unstable idle
- Excessive oil consumption between changes
- Hissing or whistling sound from engine area
- Poor acceleration and turbo boost loss
How to Fix
Replace the valve cover assembly (includes new PCV diaphragm) with the updated GM design. Replace the intake manifold check valve simultaneously. Inspect the corrugated PCV hose from intake manifold to turbo for cracks. Use only GM or quality aftermarket valve covers - cheap replacements fail quickly.
Sources for this issue (2)
MINI GP · 2007–2014
The N14 and N18 engines fitted to the GP1 and GP2 are well-documented for crankcase ventilation oil separator (CCV) failure, where the plastic separator housing cracks or the internal membrane fails. A failed CCV causes excessive oil to be drawn into the intake manifold and combustion chambers, resulting in visible blue smoke from the exhaust and abnormally high oil consumption between service intervals. MINI issued TSB SI B11 06 11 addressing this concern on N14 and N18 engines.
Common Symptoms
- Blue or grey smoke from exhaust especially on startup
- Oil consumption exceeding 1 quart per 1,000 miles
- Oil residue visible in intake tract or intercooler pipes
- Rough idle due to oil fouling throttle body
- Check engine light with lean or misfire codes
How to Fix
Replace the oil separator/CCV unit (OEM part 11617533400 for N14, 11617588885 for N18). The repair also requires cleaning the intake manifold and throttle body of oil residue. Parts cost $80-$180; total repair including labor typically $250-$600 at an independent specialist.
Dodge Dart · 2013–2016
Mazda 626 · 1993–1999
Find P0507 by make
Browse every documented model and issue for your make.
P0507 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0507 mean?
P0507 stands for "Idle Air Control System RPM Higher Than Expected." This code means the engine is idling faster than the computer's target idle speed, typically by a set margin such as 200 RPM above commanded. The engine control module manages idle by metering a small amount of air around the throttle plate (via an idle air control valve or electronic throttle), and when it can't bring the RPM down to target it flags this code. The most common real cause is unmetered air sneaking into the intake — a vacuum leak — that the computer can't compensate for. It generally indicates extra air entering the engine or a problem with the idle/throttle control system.
What are the most common causes of P0507?
The most common causes of P0507 are: Vacuum or intake air leak (hoses, gaskets, intake boot), Dirty or sticking throttle body or throttle plate, Faulty or stuck idle air control valve, Leaking intake manifold or throttle body gasket, Stuck-open PCV valve or cracked PCV hose, Dirty mass airflow sensor giving false readings, Failing throttle position sensor, Leaking brake booster or its vacuum hose. The specific cause varies by vehicle.
How much does it cost to fix P0507?
Repair costs for P0507 range from $20 to $2,200, depending on the vehicle and root cause.
Which vehicles are affected by P0507?
Au7o has documented P0507 across 18 vehicle models from 13 manufacturers: Audi, Chevrolet, Chrysler, Dodge, Ford, Honda, MINI, Mazda, Mercedes-Benz, Nissan, Toyota, Volkswagen, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.