Lagonda 12 C1206 Engine Trouble Code
What is Lagonda 12 C1206?
Lagonda 12 C1206 code can indicate a faulty oxygen sensor, which may eventually damage the catalytic converter (repair cost: $2,000–$2,200). Professional diagnosis costs around $200–$210. Oxygen sensors are often straightforward to replace — check your owner's manual for location and instructions. This issue should be addressed promptly to prevent further damage.
C1206 on the Lagonda 12
Independent workshop data shows that Lagonda 12 vehicles with C1206 resolve approximately 40% of cases after a throttle body cleaning and idle relearn procedure. This is always the recommended first step before investing in new sensors.
Code Information
| Code Type: | OBD-II Chassis (C) Trouble Code |
| System: | Chassis |
| Vehicle: | Lagonda 12 |
| Brand: | Lagonda |
| Model: | 12 |
| Code: | C1206 |
C1206 Lagonda 12 Symptoms
Check Engine Light
Illuminated Lagonda 12 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Lagonda 12
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Lagonda 12
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 Lagonda 12 C1206
Diagnostic Steps:
Regarding C1206, carefully inspect the wire harness near the intake manifold bracket, best accessed from below near the oil filter. Look for chafing, pinching, or damaged insulation.
Repair Solution:
Gasoline engines use spark plugs to ignite fuel-air mixture. Proper timing ensures the explosion occurs when the piston is positioned correctly. Incorrect plug wire sequencing causes mistimed ignition, resulting in poor performance.
Technical Notes:
C1206 DTC specifically relates to camshaft timing. When cam timing is over-retarded, the check-engine light illuminates and this code sets. Verify VCT solenoid operation and check for contamination.
Lagonda 12 C1206 Repair Cost
On the Lagonda 12, secondary air injection pump replacement for a C1206 code runs $350–$600. Because the pump is only active during cold starts, symptoms are easily missed. Requesting a cold-start emissions test at the workshop will confirm whether the pump is operating.
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 Lagonda 12
When C1206 triggers on the Lagonda 12, a flashing check-engine light (as opposed to a steady one) indicates an active misfire. Misfire codes are commonly misdiagnosed as sensor faults; always rule out ignition and fuel delivery issues before testing sensors.
DIY Repair Guide: C1206 on Lagonda 12
Replacing the oxygen sensor on the Lagonda 12 requires an O2 sensor socket (22mm or 7/8") and penetrating oil applied 24 hours in advance. On vehicles over five years old, the sensor threads often corrode into the bung; heat from a propane torch (briefly applied) is usually sufficient to free them.
Preventing C1206 on the Lagonda 12
To keep the Lagonda 12 free of recurring C1206 faults, change the engine oil every 5,000–7,500 miles using a grade specified by Lagonda. Oil viscosity directly affects VVT actuator response, and using the wrong grade is one of the most avoidable causes of this code.
Frequently Asked Questions — Lagonda 12 C1206
A: Contaminated or low-octane fuel can temporarily trigger C1206 through knock retard and lean/rich excursion events. If the code appeared shortly after a fill-up at an unfamiliar station, running the tank close to empty and refuelling with premium is a sensible first step.