Jaguar Xj-220 B1566 Engine Trouble Code
What is Jaguar Xj-220 B1566?
Jaguar Xj-220 B1566 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.
B1566 on the Jaguar Xj-220
On the Jaguar Xj-220, a secondary air injection pump that has seized due to moisture ingress is a common trigger for B1566. 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 Body (B) Trouble Code |
| System: | Body |
| Vehicle: | Jaguar Xj-220 |
| Brand: | Jaguar |
| Model: | Xj-220 |
| Code: | B1566 |
B1566 Jaguar Xj-220 Symptoms
Check Engine Light
Illuminated Jaguar Xj-220 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Jaguar Xj-220
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Jaguar Xj-220
Increased Emissions
Failed emissions test due to B1566
B1566 Code Structure
Understanding what each digit means in the B1566 body trouble code:
| B | 1 | 5 | 6 | 6 |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering | Fuel Composition Sensor Circuit Malfunction | Cylinder 4 Contribution/Balance Fault | Ignition Coil A Primary/Secondary Circuit Malfunction |
How to Fix Jaguar Xj-220 B1566
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:
VSS concerns may stem from noisy input signals caused by RFI/EMI from ignition wires, charging circuits, or aftermarket equipment. Verify VSS reads 0 mph when transmission is in Park.
Technical Notes:
B1566 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.
Jaguar Xj-220 B1566 Repair Cost
The EVAP purge valve is among the cheapest B1566 fixes on the Jaguar Xj-220: the part itself retails for $25–$60 and installation takes under 30 minutes. A DIY-capable owner can complete this repair at home, keeping total expenditure below $80.
B1566 Description
B1566 engine trouble code is related to Ignition Coil A Primary/Secondary Circuit Malfunction.
Main Cause
The primary reason for B1566 OBD-II Engine Trouble Code is: Fuel Composition Sensor Circuit Malfunction.
Common B1566 Misdiagnosis on the Jaguar Xj-220
On the Jaguar Xj-220, the VANOS (variable camshaft timing) solenoid is routinely replaced for B1566 when the actual issue is oil pressure insufficiency. No solenoid will operate correctly if the oil pressure required to actuate the VVT phaser is not present.
DIY Repair Guide: B1566 on Jaguar Xj-220
The Jaguar Xj-220 EVAP purge solenoid valve is accessible without lifting the vehicle — it is mounted on the intake manifold and secured by a single bolt and a vacuum hose clip. DIY replacement is rated 1/5 difficulty and takes approximately 20 minutes.
Preventing B1566 on the Jaguar Xj-220
The Jaguar Xj-220 heat shield over the exhaust manifold protects the nearby sensor wiring from radiant heat damage. Inspect it for cracks or displacement at every brake service. A $15 replacement shield can prevent $300+ wiring loom repairs.
Frequently Asked Questions — Jaguar Xj-220 B1566
A: Not always. Across model years, Jaguar 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.