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I gather that the upstream O2 sensor is the one right in the center of this picture. I also gather that the catalytic converter (the "cat") is the bulbous part of the exhaust right behind this sensor.

upstream

Question 1: Does the cat consist of just this one part or does it include the second 'bulb' in the exhaust that appears in this second picture?

midstream

Question 2: This third picture shows the section closest to the tail pipe. I can't spot the downstream O2 sensor. Can you suggest where I should be looking?

downstream

Calaf
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1 Answers1

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Picture 1 is the downstream 02 sensor. Upstream is located on the exhaust manifold.
Picture 1 contains both convertors.

Picture 2 is the exhaust resonator.

Ben
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