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P0135 - Primary heated Oxygen sensor (sensor 1)

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Old Nov 7, 2005 | 09:40 AM
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Default P0135 - Primary heated Oxygen sensor (sensor 1)

Does anyone know if this is the one before the CAT (on top of the engine) or after the CAT underneath the car ? Car is a '99 Civic.

thanks,
Bbo
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Old Nov 7, 2005 | 10:27 AM
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Primary is the number one sensor before the cat.
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2005 s2000
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Old Nov 7, 2005 | 11:16 AM
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Default thanks !

It would be nice if the OBD code told you "B4 or after CAT" but I'll remember now.

Bob
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Old Nov 7, 2005 | 12:36 PM
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well primary is always before cat. have fun.
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