Ford Fairlane B1566 Engine Trouble Code
What is Ford Fairlane B1566?
The Ford Fairlane B1566 check-engine light can indicate issues ranging from minor (loose gas cap) to serious (catalytic converter failure). Professional diagnostic scanning at a dealer or shop will identify the exact cause and required repairs.
B1566 on the Ford Fairlane
Service bulletins for the Ford Fairlane specifically mention B1566 as a symptom of failed purge solenoid valves in the EVAP system. The solenoid body on this platform degrades in high-humidity environments and should be inspected whenever this code appears.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Vehicle: | Ford Fairlane |
| Brand: | Ford |
| Model: | Fairlane |
| Code: | B1566 |
B1566 Ford Fairlane Symptoms
Check Engine Light
Illuminated Ford Fairlane dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Ford Fairlane
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Ford Fairlane
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 Ford Fairlane B1566
Diagnostic Steps:
Check if fuel pump primes when key is turned to ON. Measure fuel pressure and verify bright white-blue spark at all plugs. Also verify mechanical timing alignment.
Repair Solution:
Crankshaft position sensor signals the computer for precise ignition and fuel injection timing. Faulty sensors cause rough running and reduced efficiency. Modern vehicles enter limp mode and illuminate the check-engine light.
Technical Notes:
Parts or components should not be replaced based solely on B1566 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
Ford Fairlane B1566 Repair Cost
Fuel injector cleaning service on the Ford Fairlane 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.
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 Ford Fairlane
A common error on the Ford Fairlane is attributing B1566 to the crankshaft position sensor when the real fault is a damaged flywheel ring gear. The missing tooth pattern created by ring gear damage is intermittent and generates the same signal anomaly.
DIY Repair Guide: B1566 on Ford Fairlane
For the mechanically confident Ford Fairlane owner, a DIY MAF sensor clean is a rewarding first step for B1566. Use a dedicated MAF sensor cleaner spray — not brake cleaner, which damages the sensing element — and allow the sensor to dry for 30 minutes before reinstallation.
Preventing B1566 on the Ford Fairlane
Using only genuine or OEM-specification fuel injectors in the Ford Fairlane ensures precise spray pattern and flow rate. Inferior aftermarket injectors are a documented trigger for B1566 through off-target fuel delivery.
Frequently Asked Questions — Ford Fairlane B1566
A: Yes. Any stored fault code — including B1566 — will cause an automatic failure in most OBD-II based emissions tests. The code must be resolved and the vehicle must complete a full OBD drive cycle with no new codes before the test.