Acura Legend B2594 Engine Trouble Code
What is Acura Legend B2594?
Acura Legend B2594 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.
B2594 on the Acura Legend
The Acura Legend features a sequential multi-port fuel injection (SMFI) system where injector timing is tightly synchronised with the crankshaft signal. Wear on the crankshaft reluctor ring teeth produces signal dropout events that accumulate and eventually trigger B2594.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Vehicle: | Acura Legend |
| Brand: | Acura |
| Model: | Legend |
| Code: | B2594 |
B2594 Acura Legend Symptoms
Check Engine Light
Illuminated Acura Legend dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Acura Legend
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Acura Legend
Increased Emissions
Failed emissions test due to B2594
B2594 Code Structure
Understanding what each digit means in the B2594 body trouble code:
| B | 2 | 5 | 9 | 4 |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering (Injector Circuit Malfunctions Only) | Fuel Composition Sensor Circuit Malfunction | Crankshaft Position Sensor A Circuit Malfunction | Timing Reference High Resolution Signal A Too Many Pulses |
How to Fix Acura Legend B2594
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:
Power steering pressure switch monitors system operation. If pressure changes are not detected after calibrated speed transitions, this DTC sets. Verify PSP switch operation and check for circuit opens or shorts.
Technical Notes:
B2594 DTCs can be triggered by upstream issues. For example, a dirty MAF sensor may cause incorrect fuel-trim adjustments, leading oxygen sensors to report mixture problems. Address root causes first.
Acura Legend B2594 Repair Cost
Torque converter clutch solenoid replacement on the Acura Legend — relevant for owners who tow regularly — costs $280–$480. A full transmission fluid change ($120–$160) at the same service is recommended because contaminated fluid accelerates solenoid wear.
B2594 Description
B2594 engine trouble code is related to Timing Reference High Resolution Signal A Too Many Pulses.
Main Cause
The primary reason for B2594 OBD-II Engine Trouble Code is: Fuel Composition Sensor Circuit Malfunction.
Common B2594 Misdiagnosis on the Acura Legend
The Acura Legend knock sensor shares its harness with the coolant temperature sensor. A corroded shared ground causes both sensors to report out-of-range values simultaneously, leading to misdiagnosis of B2594 as a knock sensor fault when the root cause is the shared ground splice.
DIY Repair Guide: B2594 on Acura Legend
For Acura Legend owners without a scan tool, a free diagnostic check is available at most franchised Acura dealers during a courtesy health-check appointment. This provides the DTC number needed to research the exact cause of B2594 before committing to any repair.
Preventing B2594 on the Acura Legend
Ensure the Acura Legend oil cap and dipstick tube seal are airtight. Even a small crank-case vacuum leak can cause the PCM to log B2594 and, over time, allows moisture-laden air to degrade the engine oil faster than the scheduled service interval.
Frequently Asked Questions — Acura Legend B2594
A: If your Acura Legend is within the factory powertrain warranty period (typically 3–5 years or 60,000–100,000 miles depending on region and generation), B2594 repairs caused by component defects should be covered. Bring your service history to the dealer appointment.