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Archive Tag: air filter

Air Filter and Housing Inspection: Damaged Housing or Filter Seal Prompts Low Efficiency Catalyst Codes

Air Filter and Housing Inspection: Damaged Housing or Filter Seal Prompts Low Efficiency Catalyst Codes

June 15, 2019

When low-efficiency catalyst codes PO420 and PO430 appear, the last place that most technicians would consider would be a defective air filter seal or damaged/distorted airbox, allowing air filter by-pass. Often, the mentioned codes result in oxygen sensors and the catalytic converter getting replaced, which may be a short-term expensive fix, especially when the condition […]

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