Code Definition

P1402 — EGR System

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Nissan

About P1402

P1402 is a manufacturer-specific powertrain diagnostic trouble code recorded for Nissan vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1402 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The EGR system on Nissan engines recirculates a metered amount of exhaust gas into the intake to reduce combustion temperatures and NOx emissions, with flow controlled by the EGR valve and EGRC solenoid and verified by the EGR temperature sensor. DTC P1402 is an EGR function code that sets when the Engine Control Module (ECM) commands EGR but does not detect the expected change in EGR temperature or intake conditions, indicating insufficient or excessive exhaust gas flow. The most common real world cause is carbon blockage in the EGR valve or passages restricting flow. When this code is stored...

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