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Ford F-350 P0420: Catalyst System Efficiency → Below Threshold → Bank 1
2018 3.5 EB issues, codes P0018 and P0021 - Ford F150 Forum - Community
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2018 3.5 EB issues, codes P0018 and P0021 - Ford F150 Forum - Community
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Ford F150 P0301: Misfire - Cylinder 1 | Drivetrain Resource