Fault Family System: Powertrain (P-Codes) 38 SAE Codes

NOx Sensor Heater Circuit

Diagnostic & Technical Explanation

P2205 (NOx Sensor Heater Control Circuit/Open Bank 1 Sensor 1) concerns the heater that brings the NOx sensor's ceramic sensing element to its roughly 800 C operating temperature, and covers open/shorted heater drive, an implausible heater-sense feedback reading, and element resistance outside specification. Because the heater lives inside the sealed sensor body, a genuine heater failure requires a complete sensor assembly; before that expense, the heater fuse and the connector — frequently corroded by road spray at its underbody location — must be ruled out.

These 38 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 38 times.

Codes in this family (38)

Code	Definition	Repair coverage
P2205	NOx Sensor Heater Control Circuit/Open Bank 1 Sensor 1	3 ranked fixes
P2206	NOx Sensor Heater Control Circuit Low Bank 1 Sensor 1	3 ranked fixes
P2207	NOx Sensor Heater Control Circuit High Bank 1 Sensor 1	3 ranked fixes
P2208	NOx Sensor Heater Sense Circuit Bank 1 Sensor 1	3 ranked fixes
P2209	NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1	3 ranked fixes
P220E	NOx Sensor Heater Control Circuit Range/Performance Bank 1 Sensor 1	3 ranked fixes
P220F	NOx Sensor Heater Control Circuit Range/Performance Bank 1 Sensor 2	3 ranked fixes
P2210	NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 1	3 ranked fixes
P2211	NOx Sensor Heater Sense Circuit High Bank 1 Sensor 1	3 ranked fixes
P2212	NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 1	3 ranked fixes
P2218	NOx Sensor Heater Control Circuit/Open Bank 2	3 ranked fixes
P2219	NOx Sensor Heater Control Circuit Low Bank 2	3 ranked fixes
P2220	NOx Sensor Heater Control Circuit High Bank 2	3 ranked fixes
P2221	NOx Sensor Heater Sense Circuit Bank 2	3 ranked fixes
P2222	NOx Sensor Heater Sense Circuit Range/Performance Bank 2	3 ranked fixes
P2223	NOx Sensor Heater Sense Circuit Low Bank 2	3 ranked fixes
P2224	NOx Sensor Heater Sense Circuit High Bank 2	3 ranked fixes
P2225	NOx Sensor Heater Sense Circuit Intermittent Bank 2	3 ranked fixes
P224A	NOx Sensor Heater Resistance Bank 1 Sensor 1	3 ranked fixes
P224B	NOx Sensor Heater Resistance Bank 1 Sensor 2	3 ranked fixes
P22A3	NOx Sensor Heater Control Circuit/Open Bank 1 Sensor 2	3 ranked fixes
P22A4	NOx Sensor Heater Control Circuit Low Bank 1 Sensor 2	3 ranked fixes
P22A5	NOx Sensor Heater Control Circuit High Bank 1 Sensor 2	3 ranked fixes
P22A6	NOx Sensor Heater Sense Circuit Bank 1 Sensor 2	3 ranked fixes
P22A7	NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 2	3 ranked fixes
P22A8	NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 2	3 ranked fixes
P22A9	NOx Sensor Heater Sense Circuit High Bank 1 Sensor 2	3 ranked fixes
P22AA	NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 2	3 ranked fixes
P23B1	NOx Sensor Heater Control Circuit/Open Bank 1 Sensor 3	3 ranked fixes
P23B2	NOx Sensor Heater Control Circuit Low Bank 1 Sensor 3	3 ranked fixes
P23B3	NOx Sensor Heater Control Circuit High Bank 1 Sensor 3	3 ranked fixes
P23B4	NOx Sensor Heater Sense Circuit Bank 1 Sensor 3	3 ranked fixes
P23B5	NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 3	3 ranked fixes
P23B7	NOx Sensor Heater Control Circuit Range/Performance Bank 1 Sensor 3	3 ranked fixes
P23B8	NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 3	3 ranked fixes
P23B9	NOx Sensor Heater Sense Circuit High Bank 1 Sensor 3	3 ranked fixes
P23BA	NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 3	3 ranked fixes
P23BB	NOx Sensor Heater Resistance Bank 1 Sensor 3	3 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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