Catalytic converter question CARB CERTIFIED
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Cross-Country
Joined: Dec 2023
Posts: 64
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From: Central Valley, Cali
Catalytic converter question CARB CERTIFIED
Hi y'all thank you for your help on the last post, I drive a 1997 Ford f-250 HD single cab long bed 460 (7.5) e40d and have a few questions. First off I noticed there is only one O2 sensor is this normal? Also the holes on my cat are too big for my sensor. And is the sensor supposed to be after the cat? My old one had a hole in the pipe coming after the cat but the new one does not. Is it okay if I run it without a sensor for a few days until I weld a fitting next week. And yes it had the MAF sensor, I LIVE IN CALIFORNIA CARB VERIFICATION
Logistics Pro
Joined: Nov 2013
Posts: 3,928
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From: Mojave, Ca
Check under your hood at the emissions sticker and see if it's a California emissions truck or a federal emissions truck.
California trucks were OBD2 and use 2 O2 sensors. Federal trucks were EEC-IV and only used one O2 sensor in front of the cat.
California trucks were OBD2 and use 2 O2 sensors. Federal trucks were EEC-IV and only used one O2 sensor in front of the cat.
Cargo Master
Joined: Mar 2007
Posts: 2,831
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You need two O2 sensors to watch the cat for OBD2. If you got 1 catalyst, you only need one set of O2 sensors.
Many V8's had two catalysts, but it would not surprise me that an old big block on it's last couple years had just one.
Many V8's had two catalysts, but it would not surprise me that an old big block on it's last couple years had just one.
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