If your 2008 Subaru Legacy with an automatic transmission throws a P1364 code and no other model or year does it’s not random. It’s tied directly to how Subaru engineered the crankshaft position (CKP) and camshaft position (CMP) sensor timing relationship in that specific powertrain setup. This code doesn’t appear in manual-transmission Legacies from the same year, nor in 2007 or 2009 models, because the ECU calibration, wiring harness routing, and even the physical placement of the CMP sensor changed slightly across model years and drivetrain configurations.

What does P1364 actually mean on a 2008 Legacy automatic?

P1364 is a manufacturer-specific OBD-II code meaning “Crankshaft Position – Camshaft Position Correlation Bank 1 Sensor A.” In plain terms: the engine control unit expects the crankshaft and camshaft signals to line up within a tight window during startup and idle. When they don’t especially during cold starts or after the vehicle sits overnight the ECU logs P1364. On the 2008 Legacy automatic, this mismatch almost always traces back to one of two things: a worn or oil-soaked CMP sensor (located behind the timing cover, near the intake cam sprocket), or a subtle timing chain stretch that shifts phasing just enough to trip the correlation threshold. Unlike Honda or Ford applications, where P1364 can point to VTC solenoid issues or PCM reflash needs, Subaru’s implementation here is tightly coupled to mechanical timing integrity.

Why doesn’t P1364 show up in other Legacy years or transmissions?

The 2008 automatic Legacy uses the EJ253 engine paired with the 4EAT transmission and a specific version of the Subaru SI-Drive ECU software. That software has tighter correlation tolerances than earlier or later calibrations and it’s more sensitive to small phase errors introduced by aging components. Manual-transmission models use different ECU tuning and lack the same load-dependent timing expectations during clutch engagement, so the same physical wear won’t trigger P1364. You’ll see similar behavior in other vehicles, but for different reasons: on a 2003 Honda Accord, it’s often a faulty VTEC oil pressure switch; on a Ford F-150 with the 5.4L, it’s usually a worn cam phaser. The root cause is vehicle-specific not universal.

What mistakes do people make diagnosing P1364 on this car?

Most common error: replacing the crankshaft sensor first. The CKP sensor rarely fails on these engines, and swapping it without checking the CMP sensor or timing chain deflection won’t fix P1364. Another mistake is clearing the code and assuming it’s gone P1364 often returns only after several cold starts, so a quick test drive won’t catch it. Some shops also skip checking for oil contamination at the CMP sensor connector; if oil has seeped into the harness (a known issue on high-mileage EJ253s), cleaning or replacing just the sensor won’t help long-term. And finally, ignoring the fact that P1364 alone doesn’t confirm timing chain stretch it needs verification with a degree wheel or oscilloscope comparison of CKP vs. CMP waveforms.

What should you check first?

Start with the CMP sensor and its connector. Look for oil residue, bent pins, or corrosion. If the sensor is wet or discolored, replace it with an OEM or Denso unit not a generic aftermarket part. Then inspect the timing chain tensioner for rattle or excessive play. If the engine has over 120,000 miles, consider checking chain stretch with a dial indicator on the crank pulley (spec is less than 5° of deflection). Also verify battery voltage stays above 12.4V when cranking if it dips below 11.8V, low voltage can skew sensor signal interpretation and mimic a correlation fault.

How is this different from P1364 in other cars?

While the code number is the same, its meaning isn’t portable. On a 2007–2012 Nissan Altima 2.5L, P1364 points to a failed camshaft position actuator solenoid not timing chain wear. In Subarus, it’s about signal alignment; in Nissans, it’s about hydraulic actuation response. That’s why chasing generic P1364 fixes leads to wasted time and parts. Always go by the vehicle make, model, year, and transmission type not just the code.

Next step: Before buying parts, scan live data for CMP and CKP correlation values using a capable scanner (like Techstream or Snap-on MODIS). Watch the “Cam/Crank Sync” or “Phase Offset” PID while idling cold. If it drifts beyond ±3°, suspect CMP sensor or timing chain. If it holds steady but the code still appears, check for intermittent wiring faults between the sensor and ECU especially near the firewall grommet, where chafing is common on 2008 Legacies.