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I'm getting P0420, Catalyst System Efficiency Below Threshold (Bank 1) . So, I'll do them both. Dealer, whom I trust, also told me they needed to be replaced.
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2005 X5 3.0, Manual Transmission, Black on Black, Sport Suspension, 250,000+ miles and counting, Best SUV I've ever owned
Last edited by ThomHart; 09-01-2014 at 03:02 PM.
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