Parts for your 2007 Subaru Tribeca-Knock sensor

2007 Subaru Tribeca knock sensor — what it does and how to look after it

Yes, the 2007 Subaru Tribeca is fitted with knock sensors. Technical sources including the Subaru Factory Service Manual (B9 Tribeca, 2006–2007MY, Engine Diagnostics section) list DTCs P0327/P0328 for “Knock Sensor 1” and show the knock sensor circuits in the wiring diagrams for the EZ30 H6. Subaru’s parts catalogue (FAST) also lists a “Sensor – Knock,” typically p/n 22060AA070 (superseded in some listings by 22060AA100), with two sensors used on the EZ30 engine—one per bank.

On the 2007 Tribeca, the knock sensor’s job is to “listen” for pinging (detonation) and tell the ECU to tweak ignition timing so the engine stays smooth and protected. That lets the H6 run happily on the recommended fuel whilst keeping performance and economy on song. The Tribeca uses two sensors mounted on the top of the block under the intake manifold, one for each cylinder bank, so the ECU can pinpoint where any knock is happening.

They aren’t a routine service item, but they do benefit from a bit of care during regular servicing. If the Check Engine light pops up with codes like P0327 or P0328, or the car feels a bit doughy with higher fuel use, the ECU may be pulling timing because it can’t trust the knock signal. Before swapping parts, it’s smart to check the basics: clean, tight engine grounds, intact sensor connectors, and undamaged wiring looms routed exactly as from factory. The sensor needs a clean, flat mating surface on the block and the correct torque on the single mounting bolt—over-tightening or rotating the sensor after tightening can crack it or skew readings.

When replacement is needed, go for genuine or high‑quality OEM‑equivalent sensors and new loom clips. Because the sensors live under the intake manifold, access is moderate—expect some labour to remove the manifold and renew gaskets. After fitting, clear codes and allow the ECU to relearn, a gentle mixed drive over 20–50 km usually does it. Sticking with the octane recommended in the owner’s manual (often 95 RON in AU/NZ for the H6) helps the sensors and ECU keep combustion tidy. If there’s persistent pinging under load, don’t ignore it—book it in, as proper detonation control is key to keeping the EZ30 healthy for the long haul.

• Typical signs of trouble: CEL with P0327/P0328, sluggish performance, poor fuel economy.
• Good practice: inspect wiring/grounds, avoid cheap copies, torque to spec, don’t rotate the sensor once tightened.
• Replacement time: intake manifold off, plan for new gaskets and clips.

Popular questions about 2007 Subaru Tribeca knock sensors

Does the 2007 Tribeca have one or two knock sensors, and where are they?
It runs two sensors on the EZ30 H6—one per cylinder bank. They’re bolted to the top of the engine block under the intake manifold. Access normally requires removing the manifold, so it’s often paired with renewing intake gaskets and checking loom clips.

Is it safe to drive with a bad knock sensor?
The ECU will usually pull timing to protect the engine, so it may feel flat and use more petrol. Short local trips at light throttle are generally low risk, but prolonged driving or heavy loads aren’t wise. If the sensor or wiring can’t report knock properly, genuine detonation could go undetected—get it diagnosed and sorted promptly.

What are common causes of knock sensor faults on this model?
Aside from sensor age, the usual culprits are cracked connectors, chafed wiring under the manifold, poor engine grounds, or incorrect sensor torque/installation. Oil or coolant leaks that wick into the connector can also play havoc. A quick harness and ground check often saves swapping parts unnecessarily.