Parts for your 2015 Ford Transit-Knock sensor

2015 Ford Transit Knock Sensor – What it is, where it fits, and when to service it

Based on Ford’s 2015 Transit Workshop Manual and wiring diagrams for the 3.5L GTDI (EcoBoost) and 3.7L Ti‑VCT petrol engines (WSM Section 303‑14 – Electronic Engine Control, DTC listings P0325/P0330, component location and KS circuit diagrams), this model uses knock sensors. The factory literature for the 3.2L Power Stroke diesel (Duratorq) does not list a knock sensor in its component set for combustion control, which aligns with common-rail diesel strategy relying on rail pressure, injection timing and crank speed variation rather than spark knock detection. So, if the van’s a petrol V6 (3.5 or 3.7), it’s got knock sensors, if it’s the 3.2 diesel, it doesn’t.

On the petrol 2015 Ford Transit, the knock sensor (KS) is the quiet achiever that keeps the engine running sweet as. It listens for knock (pinging) through the block and lets the PCM trim ignition timing to suit the fuel and load. That means better drivability, safer combustion under heavy loads, and protection for pistons and bearings on hot days or when towing. Ford’s service info shows the PCM actively monitors the KS circuit and will log a fault if the signal goes missing, which is why a dodgy sensor can light the MIL and pull power.

For servicing, the KS isn’t a regular “replace by kilometres” item, it’s a diagnose-and-replace part. If there’s poor performance, rattly pinging, or codes like P0325/P0330, a tech should confirm the issue before swapping parts. Always follow the Ford WSM for access, torque specs, angle tightening (if specified), and routing of the harness to avoid false readings. Because the sensors are torqued to the block, over- or under‑tightening can skew sensitivity.

• Symptoms worth checking: pinging under load, reduced power, worse fuel economy, MIL on with KS codes, or timing pulled in live data.
• Good practice: inspect the KS connector for oil ingress, check loom chafe under the intake, and rule out real causes of knock (low‑octane fuel, intake leaks, carbon buildup) before blaming the sensor.
• Replacement tips: disconnect the battery, remove intake components as needed for access, fit genuine‑spec sensors, and clear codes. Perform a road test under load so the PCM can relearn knock characteristics.

Owners running 91 RON can still rely on the KS to keep things safe, but using quality fuel helps the system do less heavy lifting. For the 3.2 diesel crew, there’s no KS to service—combustion is managed a different way—so focus on fuel system health and air management instead.

Popular questions about the 2015 Ford Transit knock sensor

Does every 2015 Transit have a knock sensor?
No. The 3.5L EcoBoost and 3.7L petrol V6 engines use knock sensors, as documented in Ford’s 2015 Workshop Manual and wiring diagrams. The 3.2L Power Stroke diesel does not use a knock sensor, relying on diesel‑specific control strategies instead.

What are the signs of a failing knock sensor on a 2015 Transit?
Common signs include a check engine light with codes like P0325/P0330, noticeable loss of grunt, worse fuel economy, or audible pinging under load. It’s smart to verify fuel quality and check for intake or vacuum issues before replacing the sensor.

Is it safe to drive with a knock sensor fault?
The van will usually default to conservative timing to protect the engine, so it may feel sluggish. Short hops are typically fine, but prolonged driving under load isn’t wise. Sort the fault sooner rather than later to avoid poor performance and potential engine stress.