2010 Jeep Wrangler Unlimited Mountain MIL P040 - Jeep Wrangler Forum
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Old 08-04-2012, 01:09 PM   #1
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Join Date: Aug 2012
Location: Los Lunas,NM
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2010 Jeep Wrangler Unlimited Mountain MIL P040

My Malfunction Indicator Light (MIL) came on. I took it to O'Reilly Auto parts and had them read it. The readout is: "Catalyst System Efficiency below threshold (Bank 2). Can anybody tell me what this means?"

I'm having difficult getting anybody from Mark's Casa Chrysler Jeep Service Department to call me to explain it and what to do next!

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