wtb - 3rd gen o2 sensor
- Thread starter stdntDrvr
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I thought there was a difference in how they heated up. I know the secondary has longer wires (even without the MSP extension) than the primary. The secondary's wires are like 12" ling whereas the primary has only 6" wires give or take.
shane02pro5
25ish_psi
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- New Caney TX
You can use a universal and splice it in from the auto parts for like $70 they call out the same ngk sensor for front and rear.
cougar10agREDUX
Member
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- 2003 Protege ES-T
you can buy a new OEM one for $120. worth it considering they crap out after ~20k miles
cougar10agREDUX
Member
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- 2003 Protege ES-T
well if it's the secondary.. i'm assuming it's damaged or are you just getting a check engine light? i'm sure you know about using sparkplug non foulers as an o2 simulator. second O2 sensor is bulls*** anyway, just to tell the car the cat works. since ur tight on money i'd just find the cheapest generic you can find, splice it onto the connector and put an o2 sim on there.
mp3-79bronco
Member
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- 2001 protege mp3
ill sell you the one you sold me on the pipe back for 25 lol
SAMOTORSPORTS
Member
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- 02 Protege 5
my check engine light is on also. the code was PO421 which is catalys under threshhold. I figure it is the upstream sensor. would that do the job?
SAMOTORSPORTS
Member
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- 02 Protege 5
i think they said it was the closer one so i took that as the primary. in front
cougar10agREDUX
Member
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- 2003 Protege ES-T
the secondary (rear, downstream w/e you wanna call it) is what tells the ECU if the cat is working or not.
the primary is BEFORE the cats, it's what the ECU uses to set the fuel trims.
the primary is BEFORE the cats, it's what the ECU uses to set the fuel trims.
SAMOTORSPORTS
Member
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- 02 Protege 5
my car idles about 1k til it warms up from cold start and then drops to normal. other than thatg there is no change in performance of the motor.
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