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Down pipe sensors


Earl

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I am replacing my down pipe with an after market one, but have a problem that there is only one hole at the top of the after market down pipe for the oxy sensor but there is another one (so 2 in total)after the cat on the OEM.

What happens to this one? Is it required?

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if you are fitting a catless down pipe you wont need it,

i just plugged it in and pointed and secured it in the engine bay

i think some are for exhaust temp

and some measure after the cat

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What year/model car? The bottom one is a temp sensor used by the ECU to tell you when the CAT converter overheats for emissions reasons.

If you don\'t have one of these sensors near the CAT, bung it up. Otherwise you can put the sensor back in, or bung it up and just wire in a resistor to trick the ECU.

EDIT: Damn, beat to the punch.

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dont quite understand last comment.OEM down pipe 2 sensors

New aftermarket downpipe one hole at top only.

So I put the top sensor in the top hole and throw the bottom one in the junk. So what resistance to trick the ECU?

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 Earl said:

dont quite understand last comment.OEM down pipe 2 sensors

New aftermarket downpipe one hole at top only.

So I put the top sensor in the top hole and throw the bottom one in the junk. So what resistance to trick the ECU?

Oh sorry! I completely read that wrong. I\'m not sure on the resistance tbh. Maybe just keep the sensor hooked up and just hide it? I\'m sure it doesn\'t affect the performance or economy of the car.

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