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FYI/Thorley Header-O2 Sensor

2803 Views 18 Replies 9 Participants Last post by  KesekiSupra
When I first got my car, I used a Bosch O2 sensor, and it passed emissions . I recently failed emissions, and broke down and bought a factory sensor $98. Between tests I had put on a Thorley header. Comparing both O2 sensors side by side, I see why I failed. The Bosch is so short at the tip, that it wasn't even in the exhaust stream. The Toyota sensor is much longer at the tip, and was designed to work with the header, that was, at the time an OEM accessory part. This was an expensive mistake trying to save a few bucks. Live and learn.
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How did the O2 sensor relocation work at the emissions test?

Also, does the O2 voltage change faster and with a bigger swing now?

What you've described makes a lot of sense, but before i start welding on my header I'd like to hear how the smog tests went.

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