Mitsubishi Ek-wagon B1566 Engine Trouble Code
What is Mitsubishi Ek-wagon B1566?
Mitsubishi Ek-wagon B1566 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.
B1566 on the Mitsubishi Ek-wagon
Diesel variants of the Mitsubishi Ek-wagon trigger B1566 most often due to swirl flap actuator failure. The plastic actuator arm breaks and the flap defaults to the closed position, causing severe intake restriction and the associated fault flag.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Vehicle: | Mitsubishi Ek-wagon |
| Brand: | Mitsubishi |
| Model: | Ek-wagon |
| Code: | B1566 |
B1566 Mitsubishi Ek-wagon Symptoms
Check Engine Light
Illuminated Mitsubishi Ek-wagon dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Mitsubishi Ek-wagon
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Mitsubishi Ek-wagon
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 Mitsubishi Ek-wagon B1566
Diagnostic Steps:
Regarding B1566, 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:
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.
Mitsubishi Ek-wagon B1566 Repair Cost
When B1566 appears on a Mitsubishi Ek-wagon, a camshaft position sensor swap costs $140–$260 all-in. This is one of the more affordable sensors on this platform. If the wiring harness is also damaged, add $60–$90 for harness repair or section replacement.
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 Mitsubishi Ek-wagon
Some Mitsubishi Ek-wagon models have a known software bug where the PCM flags B1566 after battery disconnection and reconnect. Always perform an ECU adaptation reset and drive cycle before ordering any parts following battery work.
DIY Repair Guide: B1566 on Mitsubishi Ek-wagon
The coolant temperature sensor on the Mitsubishi Ek-wagon is a straightforward DIY item (difficulty 2/5). Have a drain tray ready for the small amount of coolant that spills when the sensor is removed. Top up the cooling system afterwards and check for air pockets.
Preventing B1566 on the Mitsubishi Ek-wagon
Transmission fluid degradation on the Mitsubishi Ek-wagon directly affects solenoid operation. Replacing ATF at 40,000-mile intervals (rather than the often-quoted 'lifetime fill' recommendation) is the best insurance against shift-solenoid codes including B1566.
Frequently Asked Questions — Mitsubishi Ek-wagon 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.