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Hi friends, I have a 2011 Volvo C30 T5 R-Design and here in california we have to pass emissions to be able to register our car and my problem here is that my O2 sensor has thrown numerous codes even after replacing it twice... it has been driven 6,000 miles and no change. Any ideas what can help fix this? New exhaust system? Anything
Thanks
 

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what are the codes??you could have an intake or exhaust leak...and other causes but need the codes to diagnose..
 

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Hi friends, I have a 2011 Volvo C30 T5 R-Design and here in california we have to pass emissions to be able to register our car and my problem here is that my O2 sensor has thrown numerous codes even after replacing it twice... it has been driven 6,000 miles and no change. Any ideas what can help fix this? New exhaust system? Anything
Thanks
Upstream, downstream?


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