Lagonda 11.9 C1206 Engine Trouble Code
What is Lagonda 11.9 C1206?
Lagonda 11.9 C1206 indicates potential catalytic converter failure. If completely failed, your vehicle may not run properly and fuel economy will suffer significantly. Average replacement cost is $2,000–$2,140. This repair requires professional service and should not be delayed.
C1206 on the Lagonda 11.9
The Lagonda 11.9 has a known weak point in the lambda sensor wiring loom where it passes through the floor pan grommet. Road salt and vibration cause the insulation to crack at this point, creating an intermittent open circuit that stores C1206 without a consistent symptom.
Code Information
| Code Type: | OBD-II Chassis (C) Trouble Code |
| System: | Chassis |
| Vehicle: | Lagonda 11.9 |
| Brand: | Lagonda |
| Model: | 11.9 |
| Code: | C1206 |
C1206 Lagonda 11.9 Symptoms
Check Engine Light
Illuminated Lagonda 11.9 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Lagonda 11.9
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Lagonda 11.9
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 11.9 C1206
Diagnostic Steps:
The catalytic converter has oxygen sensors before and after it. When warm and in closed-loop mode, the upstream O2 sensor reading should fluctuate, while downstream should remain steady.
Repair Solution:
A/C pressure sensor monitors refrigerant pressure changes. DTC sets when pressure change falls outside calibration. Verify A/C system function, refrigerant charge, and electrical connections.
Technical Notes:
For C1206, verify VCT solenoid operation. Look for stuck or sticking valves caused by contamination. Consult vehicle-specific repair manual for proper component testing procedures.
Lagonda 11.9 C1206 Repair Cost
Crankshaft reluctor ring inspection and replacement on the Lagonda 11.9 is a major service item costing $600–$1,100. Given the labour required to access the component, it is advisable to replace the rear crankshaft seal and crankshaft position sensor simultaneously while the area is open.
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 11.9
When Lagonda 11.9 presents C1206 with a concurrent coolant temperature DTC, technicians sometimes replace the thermostat rather than the coolant temperature sensor (CTS). The CTS is a $15–$25 component; the thermostat job carries 1–2 hours of additional labour.
DIY Repair Guide: C1206 on Lagonda 11.9
Battery terminal cleaning on the Lagonda 11.9 is a 5-minute job that resolves a surprising number of C1206 intermittents. Use a wire brush and a bicarbonate of soda solution to clean corrosion, then apply a thin coat of petroleum jelly to the terminals after refitting.
Preventing C1206 on the Lagonda 11.9
For diesel Lagonda 11.9 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 — Lagonda 11.9 C1206
A: Not always. Across model years, Lagonda revised sensor specifications, wiring paths, and ECU calibrations. Always confirm the repair procedure matches your specific vehicle's production year and engine code, as parts and labour times can vary significantly.