OBD-II Diagnostic Trouble Codes Database

Over 20K+ codes with detailed explanations, symptoms, causes, and repair solutions. Fast search, free access, and professional-grade information for mechanics and car enthusiasts.

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Important Notice

OBD-II diagnostic codes can vary by vehicle manufacturer, model year, and specific configuration. While P-codes (powertrain) follow SAE J2012 standards, U-codes (network communication) and manufacturer-specific interpretations may differ. Always consult your vehicle's service manual or a qualified technician for accurate diagnosis.

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Search Results for "P04" (P-codes, 20 found)

20 results
PP0400 — Exhaust Gas Recirculation (EGR), System Malfunction
HIGH👁 17
PP0401 — Exhaust Gas Recirculation (EGR), Insufficient Flow
MODERATE👁 17
PP0402 — Exhaust Gas Recirculation (EGR), Excessive Flow
MODERATE👁 14
PP0403 — Exhaust Gas Recirculation (EGR), Circuit Malfunction
HIGH👁 25
PP0404 — Exhaust Gas Recirculation (EGR), Circuit Implausible Signal
MODERATE👁 29
PP0405 — Exhaust Gas Recirculation (EGR) (G98), Signal too Low
MODERATE👁 16
PP0406 — Exhaust Gas Recirculation (EGR) (G98), Signal too High
MODERATE👁 20
PP0407 — EGR Potentiometer (G212), Signal too Low
MODERATE👁 17
PP0408 — EGR Potentiometer (G212), Signal too High
MODERATE👁 30
PP0409 — Exhaust Gas Recirculation Sensor A, Circuit
HIGH👁 18
PP040A — Exhaust Gas Recirculation Temperature Sensor 'A', Circuit
MODERATE👁 17
PP040B — Exhaust Gas Recirculation Temperature Sensor 'A', Circuit Implausible Signal
MODERATE👁 14
PP040C — Exhaust Gas Recirculation Temperature Sensor 'A', Signal too Low
MODERATE👁 14
PP040D — Exhaust Gas Recirculation Temperature Sensor 'A', Signal too High
MODERATE👁 20
PP040E — Exhaust Gas Recirculation Temperature Sensor 'A', Circuit Intermittent / Erratic
MODERATE👁 14
PP040F — Exhaust Gas Recirculation Temperature Sensor 'A' / 'B', Correlation
MODERATE👁 15
PP0410 — Secondary Air Injection System, Malfunction
HIGH👁 17
PP0411 — Secondary Air Injection System, Incorrect Flow Detected
MODERATE👁 17
PP0412 — Secondary Air Injection System Switching Valve A (N112), Circuit Malfunction
HIGH👁 17
PP0413 — Secondary Air Injection System Switching Valve A (N112), Circuit Open
MODERATE👁 17
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