Fault Family System: Powertrain (P-Codes) 28 SAE Codes

NOx Sensor Circuit

Diagnostic & Technical Explanation

P2200 (NOx Sensor Circuit Bank 1 Sensor 1) indicates the smart NOx sensor module at the named bank and position is not communicating a valid concentration signal — its signal circuit is open, shorted, intermittent, its supply voltage is out of range, or its internal calibration memory has failed its checksum. NOx sensors are sealed sensor-plus-module assemblies, so an internal element or electronics failure means replacing the complete unit; the only serviceable alternatives are the supply fuse, connector corrosion, and harness damage between the module and its power feed.

These 28 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 28 times.

Codes in this family (28)

Code	Definition	Repair coverage
P2200	NOx Sensor Circuit Bank 1 Sensor 1	4 ranked fixes
P2201	NOx Sensor Circuit Range/Performance Bank 1 Sensor 1	4 ranked fixes
P2202	NOx Sensor Circuit Low Bank 1 Sensor 1	4 ranked fixes
P2203	NOx Sensor Circuit High Bank 1 Sensor 1	4 ranked fixes
P2204	NOx Sensor Circuit Intermittent Bank 1 Sensor 1	4 ranked fixes
P220A	NOx Sensor Supply Voltage Circuit Bank 1 Sensor 1	4 ranked fixes
P220B	NOx Sensor Supply Voltage Circuit Bank 1 Sensor 2	4 ranked fixes
P220C	NOx Sensor Supply Voltage Circuit Bank 2 Sensor 1	4 ranked fixes
P220D	NOx Sensor Supply Voltage Circuit Bank 2 Sensor 2	4 ranked fixes
P2213	NOx Sensor Circuit Bank 2	4 ranked fixes
P2214	NOx Sensor Circuit Range/Performance Bank 2	4 ranked fixes
P2215	NOx Sensor Circuit Low Bank 2	4 ranked fixes
P2216	NOx Sensor Circuit High Bank 2	4 ranked fixes
P2217	NOx Sensor Circuit Intermittent Bank 2	4 ranked fixes
P225A	NOx Sensor Calibration Memory Bank 1 Sensor 1	4 ranked fixes
P225B	NOx Sensor Calibration Memory Bank 1 Sensor 2	4 ranked fixes
P229E	NOx Sensor Circuit Bank 1 Sensor 2	4 ranked fixes
P229F	NOx Sensor Circuit Range/Performance Bank 1 Sensor 2	4 ranked fixes
P22A0	NOx Sensor Circuit Low Bank 1 Sensor 2	4 ranked fixes
P22A1	NOx Sensor Circuit High Bank 1 Sensor 2	4 ranked fixes
P22A2	NOx Sensor Circuit Intermittent Bank 1 Sensor 2	4 ranked fixes
P23AC	NOx Sensor Circuit Bank 1 Sensor 3	4 ranked fixes
P23AD	NOx Sensor Circuit Range/Performance Bank 1 Sensor 3	4 ranked fixes
P23AE	NOx Sensor Circuit Low Bank 1 Sensor 3	4 ranked fixes
P23AF	NOx Sensor Circuit High Bank 1 Sensor 3	4 ranked fixes
P23B0	NOx Sensor Circuit Intermittent Bank 1 Sensor 3	4 ranked fixes
P23B6	NOx Sensor Supply Voltage Circuit Bank 1 Sensor 3	4 ranked fixes
P23BC	NOx Sensor Calibration Memory Bank 1 Sensor 3	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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