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How many Oxygen Sensors are on a 2001 Toyota Highlander with 4 cylinders?

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Old 26 Jun 2010, 06:50 pm   #1 (permalink)
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Default How many Oxygen Sensors are on a 2001 Toyota Highlander with 4 cylinders?
I have been told 4 and then I was told only 2. When I checked under the hood it looked like 4. I just want to know for sure before I start buying parts.
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Old 26 Jun 2010, 06:52 pm   #2 (permalink)
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2... That is all.
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Old 26 Jun 2010, 07:01 pm   #3 (permalink)
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Four, two near the exhaust manifold visible from top and two can be seen from underneath the car on exhausts near the gearbox. The connections of all these sensors are with separate harnesses you can see on top, 2 on the left side and two on the right. You have to be very careful when disconnecting, if not careful you could break the harness. Why not get these checked before buying buying all the four in one go?Each costs about £100. Any experienced mechanic can check the faulty one.
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Old 26 Jun 2010, 07:04 pm   #4 (permalink)
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The 4-cylinder has 2 oxygen sensors - one in front of the cat, and one behind.
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