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Oxygen Sensor Question
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03-01-2019, 09:04 PM
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mccandless
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Drives: BMW 135i
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Oxygen Sensor Question
I'm installing new downpipes in my 135 N54. My question is do i need to replace the oxygen sensors? How do i know if they are still good? They are very expensive and i don't want to replace perfectly good parts.
Appreciate
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