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Bad Cat or O2 Sensors? Bad Cat or O2 Sensors?
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Old 02-11-2025, 09:51 AM
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Bad Cat or O2 Sensors?
2002 X5 E53 200K with OEM Exhaust and original Cat and no upgrades: Getting error codes on both pre-Cat and post-Cat Oxy Sensors. What are the chances that both are bad? Or is this a sign that the Cat is bad? If Cat and/or Sensors need replacing, which replacement brands do you recommend? Thanks!
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