Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU1998LEGACY OUTBACK SPORT AWD F4-2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSENGINE CONTROLS - DTC P1507, P1540, P0500, AT CODE 23
1998 Subaru Legacy Outback Sport AWD F4-2.2L SOHC
Engine Controls - DTC P1507, P1540, P0500, AT Code 23
1998 Subaru Legacy Outback Sport AWD F4-2.2L SOHCSECTION Engine Controls - DTC P1507, P1540, P0500, AT Code 23
SOURCE: Subaru Tech Tips
TITLE: DTC P1507
APPLIES TO: 96-99 Legacy
SERVICE TIP:
If you have been dealing with a persistent P1507 code on the above vehicles and the code just won't go away even after replacement parts have been installed, check the negative battery cable for corrosion/poor contact. We suggest you do a voltage drop test between the negative battery cable and the intake manifold ground. Your reading should be '0' or very close to it. Typical information we get from the techs is that while driving, the speedometer will read fine but the speed signal to the ECU quits. VSP will read '0' on New Select Monitor for ECU but, reads fine on the TCU side. You'll most likely have output from the speedometer circuit to both the ECU and TCU also.
We also recommend you do the above check for codes P1540, P0500, AT code 23 or any combination of these codes.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.