Hyundai 28510-2ELE0 Exhaust Manifold Catalytic Assembly

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On 2001 and later models, you should unplug the electrical connector for the upstream and downstream Heated Oxygen Sensors (HO2S).

To determine if a converter is restricted, use a vacuum gauge to diagnose the effect of a blocked exhaust on intake vacuum. Follow these steps: a) Connect a vacuum gauge to an intake manifold vacuum source. b) Warm the engine to operating temperature, place the transmission in Park, and apply the parking brake. c) Note and record the vacuum reading at idle. d) Open the throttle until the engine speed is about 2000 rpm. e) Release the throttle quickly and record the vacuum reading. f) Repeat the test three more times, recording the reading after each test. g) If the reading after the fourth test is more than one in-Hg lower than the idle reading, the catalytic converter, muffler, or exhaust pipes may be plugged or restricted.