Nissan 720 C1206 Engine Trouble Code
What is Nissan 720 C1206?
When Nissan 720 C1206 code appears, first check your gas cap. Pull over safely, ensure it is tight, and inspect for cracks. A loose or damaged gas cap affects fuel-system pressure and emissions. A replacement cap costs about $3–$10. This simple fix can resolve the code and improve fuel economy.
C1206 on the Nissan 720
On the Nissan 720, a secondary air injection pump that has seized due to moisture ingress is a common trigger for C1206. The fault is usually only present on cold starts and clears itself after two to three warm-up cycles, making it easy to overlook.
Code Information
| Code Type: | OBD-II Chassis (C) Trouble Code |
| System: | Chassis |
| Vehicle: | Nissan 720 |
| Brand: | Nissan |
| Model: | 720 |
| Code: | C1206 |
C1206 Nissan 720 Symptoms
Check Engine Light
Illuminated Nissan 720 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Nissan 720
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Nissan 720
Increased Emissions
Failed emissions test due to C1206
C1206 Code Structure
Understanding what each digit means in the C1206 chassis trouble code:
| C | 1 | 2 | 0 | 6 |
|---|---|---|---|---|
| Chassis Code | Fuel And Air Metering | Manifold Absolute Pressure/Barometric Pressure Circuit High Input | Cold Start Injector 1 Malfunction | Ignition Coil A Primary/Secondary Circuit Malfunction |
How to Fix Nissan 720 C1206
Diagnostic Steps:
Oxygen sensors measure exhaust gas oxygen content to optimise air-fuel ratio. This optimisation improves fuel economy and reduces emissions. Sensors degrade over time and require periodic replacement.
Repair Solution:
Disconnected, dirty, or fouled spark plugs commonly prevent proper engine operation. Replace spark plugs every season or 25 hours. Verify proper spark plug gap. If plugs are good, check ignition components: spark plug wires, coils, and ignition module.
Technical Notes:
Parts or components should not be replaced based solely on C1206 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
Nissan 720 C1206 Repair Cost
Fuel injector cleaning service on the Nissan 720 costs $150–$300 for an ultrasonic bench-clean of all injectors with flow-test certification. On-car induction cleaning is a cheaper ($80–$120) first step but is less thorough for heavily fouled injectors.
C1206 Description
C1206 engine trouble code is related to Ignition Coil A Primary/Secondary Circuit Malfunction.
Main Cause
The primary reason for C1206 OBD-II Engine Trouble Code is: Manifold Absolute Pressure/Barometric Pressure Circuit High Input.
Common C1206 Misdiagnosis on the Nissan 720
The Nissan 720 knock sensor shares its harness with the coolant temperature sensor. A corroded shared ground causes both sensors to report out-of-range values simultaneously, leading to misdiagnosis of C1206 as a knock sensor fault when the root cause is the shared ground splice.
DIY Repair Guide: C1206 on Nissan 720
For Nissan 720 owners without a scan tool, a free diagnostic check is available at most franchised Nissan dealers during a courtesy health-check appointment. This provides the DTC number needed to research the exact cause of C1206 before committing to any repair.
Preventing C1206 on the Nissan 720
For diesel Nissan 720 owners, a DPF (Diesel Particulate Filter) regeneration run on the motorway every 500 miles prevents soot blockage that back-pressures the exhaust and forces C1206 flags via the pressure differential sensors.
Frequently Asked Questions — Nissan 720 C1206
A: It depends on the severity. If the check-engine light is steady, it is generally safe to drive to a workshop within the next few days. If the light is flashing, pull over safely as soon as possible — a flashing light indicates an active misfire that can cause expensive catalytic converter damage within minutes.