P2207
NOx Sensor Circuit Low Input (Bank 2)P2207 is a generic OBD-II powertrain diagnostic trouble code: NOx Sensor Circuit Low Input (Bank 2). It is logged by the engine control unit when the scr/adblue monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P2207 means
P2207 is the Bank 2 equivalent of P2204, indicating that the ECM has detected a signal below the minimum expected threshold from the NOx sensor located on the exhaust bank that does not contain cylinder 1. This code applies to engines with two exhaust banks, such as V6, V8, and flat engines equipped with dual NOx sensors for individual bank SCR monitoring.
The low input condition arises through the same mechanisms as P2204: short to ground in the signal wiring, a failed sensing element, a heater circuit fault preventing proper warm-up, or connector issues. Because the Bank 2 sensor harness typically runs a different route than Bank 1, it may be exposed to different heat, vibration, or chafing conditions, so wiring inspection should focus on the Bank 2 harness specifically.
On vehicles with a single downstream NOx sensor covering both banks, P2207 may indicate a common-path wiring fault shared between the sensor and ECM. Regardless of sensor count, loss of Bank 2 NOx feedback degrades SCR system accuracy and may cause the ECM to default to a conservative open-loop dosing strategy.
Common causes
Most-frequently reported root causes when P2207 is logged.
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1
Short to ground in the Bank 2 NOx sensor signal wiring.
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2
Failed Bank 2 NOx sensor sensing element.
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3
Open or failed Bank 2 NOx sensor heater circuit.
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4
Connector corrosion or moisture ingress at the Bank 2 sensor.
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5
Wiring chafing on the Bank 2 harness route due to proximity to heat or sharp edges.
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6
Exhaust leak upstream of the Bank 2 sensor.
Symptoms drivers notice
How to diagnose P2207
A typical diagnostic flow when this code is present.
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1
Read and record all fault codes and freeze frame data.
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2
Compare Bank 1 and Bank 2 NOx sensor live data to isolate whether only Bank 2 is affected.
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3
Inspect the Bank 2 NOx sensor connector and harness for shorts, chafing, or moisture damage.
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4
Check heater circuit voltage and resistance for the Bank 2 sensor.
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5
Verify no exhaust leaks are present upstream of the Bank 2 sensor.
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6
Replace the Bank 2 NOx sensor if element failure is confirmed after electrical checks.
Related powertrain codes
- B0001 — PCM Discrete Input Speed Signal Error
- B0004 — PCM Discrete Input Speed Signal Not Present
- C0359 — Four Wheel Drive Low Range (4LO) Discrete Output Circuit
- C0362 — 4LO Discrete Output Circuit High
- P2000 — NOx Adsorber Efficiency Below Threshold Bank 1
- P2001 — NOx Adsorber Efficiency Below Threshold Bank 2
Frequently asked questions
If Bank 1 is fine and only Bank 2 is low, is it the sensor?
Likely yes, but always verify the Bank 2 wiring harness and connector first as they run a separate route and may be faulted independently.
Can I swap Bank 1 and Bank 2 sensors to confirm?
Only if they are identical part numbers and mounting threads match; if the fault migrates banks after swapping, the sensor is confirmed faulty.
Do both banks need working NOx sensors for the SCR to function?
On vehicles with dual sensors, both are typically required for closed-loop operation; a single failed sensor degrades SCR control accuracy.
How long do NOx sensors last?
Service life varies by vehicle and operating conditions, but NOx sensor element degradation commonly occurs between 100,000 and 200,000 kilometres.
Disabling P2207 in software
RaceTune can permanently disable P2207 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
ECUs with a P2207 disable in our catalogue
Confirmed coverage from our recipe database — we support many more families. Upload your file and our identifier will match it automatically.
- Bosch EDC17C60 verified 2 software versions
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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