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Volvo C70 This sporty coupe has a three-piece retractable hardtop for unsurpassed fun whether the the top is up or down.

O2 Sensor Wiring Question

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Old Jul 30, 2009 | 03:53 PM
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Default O2 Sensor Wiring Question
On the four wire rear o2 sensor for my '01 C70, which wire is signal and which is ground, grey or black? I know the two whites are heater.
 
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