Subaru Outback P1582 Engine Trouble Code
What is Subaru Outback P1582?
The Subaru Outback P1582 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.
P1582 on the Subaru Outback
The Subaru Outback uses a dual-port fuel injection architecture that is sensitive to ethanol content variations. When E10 fuel is substituted with E5, or vice versa, the fuel trim corrections can cross the DTC threshold and store P1582 in the ECU.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Subaru Outback |
| Brand: | Subaru |
| Model: | Outback |
| Code: | P1582 |
P1582 Subaru Outback Symptoms
Check Engine Light
Illuminated Subaru Outback dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Subaru Outback
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Subaru Outback
Increased Emissions
Failed emissions test due to P1582
P1582 Code Structure
Understanding what each digit means in the P1582 powertrain trouble code:
| P | 1 | 5 | 8 | 2 |
|---|---|---|---|---|
| Powertrain Code | Fuel And Air Metering | Fuel Composition Sensor Circuit Malfunction | Ignition/Distributor Engine Speed Input Circuit Malfunction | Glow Plug/Heater Circuit 'A' Malfunction |
How to Fix Subaru Outback P1582
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:
Brake switch circuit concerns may involve open or shorted BPP circuits, damaged switches, or misadjustment. Verify stoplight function and follow proper self-test procedures per service manual.
Technical Notes:
P1582 DTC indicating a sensor fault does not always mean the sensor itself is bad. The issue may stem from the systems being monitored or even the sensor wiring. Proper diagnosis is essential.
Subaru Outback P1582 Repair Cost
When P1582 appears on a Subaru Outback, 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.
P1582 Description
P1582 engine trouble code is related to Glow Plug/Heater Circuit 'A' Malfunction.
Main Cause
The primary reason for P1582 OBD-II Engine Trouble Code is: Fuel Composition Sensor Circuit Malfunction.
Common P1582 Misdiagnosis on the Subaru Outback
When Subaru Outback presents P1582 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: P1582 on Subaru Outback
Replacing the oxygen sensor on the Subaru Outback requires an O2 sensor socket (22mm or 7/8") and penetrating oil applied 24 hours in advance. On vehicles over five years old, the sensor threads often corrode into the bung; heat from a propane torch (briefly applied) is usually sufficient to free them.
Preventing P1582 on the Subaru Outback
For Subaru Outback owners in high-humidity climates, applying electrical contact cleaner and dielectric grease to the ECU connector pins every two years prevents the corrosion-related signal errors that register as P1582.
Frequently Asked Questions — Subaru Outback P1582
A: Simple fixes like a purge valve or gas cap replacement take under an hour. Sensor replacements typically require 1–2 hours of shop time. More involved repairs like VVT actuators or catalytic converters may require a full day or more.