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The intake hose connects the air filter housing to the throttle body or turbocharger inlet, forming a sealed duct that channels filtered air into the engine. Cracks, splits, or collapsed sections allow unmetered air to bypass the mass airflow sensor, upsetting the air-fuel ratio and causing rough running, increased fuel consumption, and fault codes. On turbocharged engines an intake air leak can also cause boost-pressure instability. Febi Bilstein, Gates, and Valeo supply OE-specification silicone and rubber intake hoses for most European and Asian vehicles. Replacing a cracked hose is one of the most cost-effective fixes for unexplained rough running.
Air leaks downstream of the mass airflow sensor cause the ECU to receive a false low-flow reading whilst the engine ingests extra air. The resulting lean condition triggers a range of symptoms.
A careful visual inspection often reveals the fault. Work along the entire length of the hose in good light, paying particular attention to bends, clamp areas, and any section that contacts hot components or sharp edges.
Most intake hoses clip or clamp in place and require only basic tools. Ensure all clamps are tight and no folds or kinks remain after fitting. Clear any MAF sensor codes and take the vehicle for a short drive to confirm the idle has stabilised.
Commonly searched OE numbers fitting Air Intake Hose from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.