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P0507 on a 2022 Kia Forte

Idle Higher Than Expected

P0507 on a 2022 Kia Forte indicates idle higher than expected. It usually stays drivable short-term but should be diagnosed promptly. The most common cause is vacuum leak (intake gasket, pcv hose, brake-booster hose, throttle-body gasket) (typically $80–$600). Confirm the root cause before replacing parts.

Severity: moderate Safe to drive (short term) Compact Sedan 2020-2024 Kia Forte

Reviewed by MECH AI Editorial · Last verified

What does P0507 mean on a 2022 Kia Forte?

P0507 is set when the ECM commands the throttle to a specific idle RPM and measures actual idle higher than that target by more than a calibrated amount (typically 200+ RPM higher). The cause is almost always unmetered air entering the engine — a vacuum leak somewhere — or a stuck throttle body / idle control issue.

This guide covers P0507 across the 2020-2024 Kia Forte generation — the symptoms, causes, and diagnostic steps below apply to every model year from 2020 through 2024.

Is it safe to drive a 2022 Kia Forte with P0507?

In most cases a 2022 Kia Forte stays drivable for short trips with P0507 active, but diagnose and repair it promptly. This is a moderate-severity code — ignoring it can lead to further damage or a failed emissions test.

What are the symptoms of P0507 on a 2022 Kia Forte?

What causes P0507 on a 2022 Kia Forte?

Cause Likelihood Estimated repair (USD)
Vacuum leak (intake gasket, PCV hose, brake-booster hose, throttle-body gasket) Most P0507 codes trace to unmetered air entering the engine. Most common $80–$600
Carbon-coked throttle body keeping the blade slightly open Common $20–$200
Failed or sticking idle air control (IAC) valve on older non-ETC vehicles Common $80–$300
Failed throttle body needing replacement and relearn Occasional $250–$800
Sticking accelerator pedal or throttle cable (older vehicles) Occasional $50–$250
Cracked plastic intake manifold Occasional $250–$900
EVAP purge valve stuck open (often sets P0496 alongside) Occasional $80–$300

How to diagnose this on a 2022 Kia Forte

  1. Confirm the actual idle RPM and check fuel trims

    Scan-tool live data should show actual idle RPM and the target. Look at Bank 1 LTFT: a high positive number (e.g. +15 % or more) confirms a real vacuum leak. Trims near zero with high idle point at a throttle body or EVAP issue rather than a leak.

    Tools: Scan tool with live PIDs

  2. Smoke-test the intake

    Pressurize the intake with smoke through a snorkel cap or the throttle body. Watch every gasket, hose, vacuum tee, the brake booster line, the PCV system, and the EVAP purge line. Smoke escaping anywhere is the leak.

    Tools: EVAP / intake smoke machine, Flashlight and inspection mirror

  3. Inspect and clean the throttle body

    Coked carbon at the throttle bore prevents the blade from closing fully — the engine pulls air around the blade that the ECM cannot fully control. Clean with throttle-body-safe cleaner (never carb cleaner) and a soft brush. Perform an idle relearn after.

    Tools: Throttle body cleaner, Soft brush, Service manual for the relearn procedure

  4. Test the IAC valve (non-ETC vehicles)

    On older vehicles with a separate IAC valve, command the valve with a scan tool and watch for idle changes. A valve that does not respond, or that idles correctly with the connector unplugged, is stuck or failed.

    Tools: Scan tool with IAC command

  5. Verify the EVAP purge valve is not stuck open

    A stuck-open purge valve introduces unmetered fuel vapor at idle, causing high idle and lean trims similar to a vacuum leak. With the engine idling, disconnect the purge valve — if idle smooths out, the purge valve is the cause.

    Tools: Hose disconnect tools

NHTSA complaints & recalls for the 2022 Kia Forte

Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2022 Kia Forte. Use these to gauge how common a problem is on your specific vehicle before you start chasing Kia Forte diagnostics.

22 owner complaints
3 involved a crash
1 involved a fire
2 reported injuries
  • ENGINE 4
  • UNKNOWN OR OTHER 5
  • FORWARD COLLISION AVOIDANCE 4
  • STEERING 3
  • SUSPENSION 3

1 active recall

  • STEERING:COLUMN May 2022

    Kia Motors America (Kia) is recalling certain 2021-2022 Rio and Forte vehicles. A bolt in the steering column may not be secured properly, which can cause the steering column to detach from the steering rack and result in a loss of steering control.…

    NHTSA campaign 22V304000

How do I fix P0507 on a 2022 Kia Forte?

About the 2020-2024 Kia Forte

The 2020-2024 Kia Forte was commonly sold with the following powertrains: 2.0L I4, 1.6L Turbo I4. Common trims include LX, LXS, GT-Line, GT.

The vacuum leak almost certainly is the cause

P0507 paired with P0171 (or P0174) is virtually always a vacuum leak. The high idle and the lean fuel trim both result from the same underlying problem: unmetered air entering the engine downstream of the MAF. The ECM cannot identify exactly which leak path is responsible, only that one exists. Smoke testing is the fastest path to the source.

Common P0507 leak locations by engine

Idle relearn after throttle body cleaning

Modern vehicles with electronic throttle control require an idle relearn after any throttle body removal, cleaning, or replacement. The procedure varies — generally:

  1. Battery disconnect 30+ seconds, reconnect
  2. Key on, engine off, 30 seconds
  3. Start engine, idle 5 minutes with no load (AC off, no electrical accessories)
  4. Drive a short cycle including a few full stops

Some vehicles require a bidirectional scan tool to perform the relearn. Without a successful relearn, P0507 will set again within a few drive cycles even though the throttle body is mechanically perfect.

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