Audi & VW Check Engine Light Diagnostic Services NH

Is your Audi or Volkswagen check engine light on? Don’t ignore it — even if the car feels fine. Many issues start small but can snowball into major repairs if left unchecked.

At Reflex Tuning, we specialize in accurate diagnostics for Audi and VW models. Our team uses factory-level tools to read fault codes, test components, and identify the root cause of the issue — not just clear the light.

⚠️ Common Audi & VW Check Engine Light Codes

Below are some of the most frequently seen P-codes and fault types on Audi and VW vehicles:

Misfires & Ignition:

• P0300 – Random/multiple cylinder misfire

• P0301–P0306 – Cylinder-specific misfire (1–6)

• P0351–P0356 – Ignition coil circuit malfunction

Catalytic Converter & Emissions:

• P0420 – Catalyst efficiency below threshold (Bank 1)

• P0430 – Catalyst efficiency below threshold (Bank 2)

• P0441 – EVAP incorrect purge flow

• P0455 – EVAP gross leak detected

• P2404 – EVAP leak detection pump sensor circuit

Turbo & Boost System:

• P0299 – Turbo/supercharger underboost

• P0234 – Turbo/supercharger overboost

• P2261 – Turbocharger bypass valve performance

• P2563 – Turbocharger boost control position sensor range/performance

Oxygen Sensors:

• P0130–P0139 – O2 sensor circuit faults

• P0171 / P0172 – System too lean / too rich

Other Common Issues:

• P2181 – Cooling system performance

• P2015 – Intake manifold runner position sensor fault

• P0016–P0017 – Camshaft/crankshaft correlation errors

• P0740 – Torque converter clutch circuit malfunction

These codes are common on vehicles like the Audi A4, Q5, A6, VW GTI, Tiguan, Passat, and Jetta — especially those with 2.0T engines.

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Why Reflex Tuning?

We don’t just plug in a scanner and guess. We use factory diagnostic software (not VCDS) , and decades of Audi/VW expertise to track down the real cause of your check engine light. You’ll get a detailed digital report with clear explanations and honest recommendations.

Located in Hooksett, NH, Reflex Tuning is the trusted independent shop for check engine light diagnostics for Audi and VW vehicles in Manchester, Concord, and southern New Hampshire.

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Check engine light on?
Schedule a diagnostic appointment today and find out what’s really going on — before it gets worse.