Code Definition

P1028 — Exhaust Gas Pressure Sensor 1 Circuit

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

About P1028

P1028 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.

When P1028 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

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.

P1028 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

On this Nissan application the engine control module uses Exhaust Gas Pressure Sensor 1 to measure pressure in the exhaust system, typically around the diesel particulate filter or turbocharger, as part of managing exhaust aftertreatment and boost. The module compares the sensor voltage against pressures calculated from the turbocharger boost sensor and the barometric pressure sensor to confirm the reading is plausible. DTC P1028 is stored when the deviation between the Exhaust Gas Pressure Sensor 1 reading and the expected pressure exceeds the manufacturer threshold for a specified duration, ...

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