The knock sensor on a Honda CR-V is mounted on the engine block near the cylinder head, typically toward the firewall side of the engine. It’s a small sensor connected by a two‑wire harness to the engine control unit (ECU).
The exact spot varies by generation and engine type, so this guide outlines common locations and how to identify the sensor in different CR‑V powertrains.
Common locations by engine type
The CR‑V uses multiple inline-4 powertrains across its generations, and the knock sensor is usually threaded into the engine block or cylinder head in the area behind the intake manifold or near the back of the engine. Use this as a practical guide to narrow down the search.
2.0L–2.4L inline-4 engines (older and some mid-generation CR‑Vs)
In these engines, the knock sensor is typically mounted on the side of the engine block or the cylinder head, near the firewall. It is a small, round or oblong sensor with a two-pin connector and is often located close to the intake manifold or behind it.
- Look for a small sensor threaded into the engine block or near the top of the side of the block, with a two-pin electrical connector that plugs into a short harness.
- Check the area just behind or under the intake manifold, along the side of the cylinder head where the engine meets the firewall.
- The wiring harness from the ECU will route toward this area, helping you spot the sensor’s approximate location.
Identifying this spot can save time when diagnosing detonation-related codes or when replacing the sensor.
Newer CR‑Vs with updated inline-4s (including 1.5L variants)
For newer engines, including some 1.5L variants, the knock sensor is usually mounted on the side of the engine block near the timing area or the lower side of the cylinder head, again close to the firewall or the back of the engine bay. The sensor remains a small unit with a two-pin connector.
- Inspect the side of the block near the timing gear area for a sensor with a two-pin plug.
- Some configurations place the sensor slightly lower on the block; you may need to tilt or move components to see it clearly.
- Use the ECU harness as a guide—the knock sensor’s harness generally runs from the ECU toward the back of the engine to this sensor.
Note that exact placement can vary by model year and engine variant, so consulting the specific service manual for your CR‑V is recommended if you’re unable to locate it quickly.
How to locate it in practice
If you’re locating the knock sensor for inspection or replacement, follow these practical steps to confirm the exact position on your CR‑V.
- With the engine off and cool, remove any engine covers or ducting that obscure the back side of the engine to access the block face.
- Trace the main engine‑level wiring harness from the ECU; the knock sensor harness branches off and leads to a sensor on the engine block or cylinder head.
- Inspect the area behind the intake manifold and along the firewall side of the engine block for a small sensor with a two‑pin connector threaded into the block.
- If visibility is poor, you may need to remove auxiliary components (such as the air intake assembly or battery tray) to gain access to the side of the engine block.
- Once located, verify the sensor by checking the electrical connector and ensuring the two‑pin plug is secure; avoid disconnecting wires while the engine is running.
Finding the knock sensor is helped by noting the typical sensor shape (small, round/oval, with a two‑wire connector) and tracing the ECU’s wiring route to the back of the engine.
Summary
In most Honda CR‑Vs, the knock sensor is mounted on the engine block or cylinder head near the firewall, often behind the intake manifold. Exact placement varies by generation and engine, so use the ECU wiring harness as a guide and consult your model year’s service manual for precise location and replacement steps. Recognizing the sensor’s small two‑pin connector and its position on the back side of the engine will help you locate it quickly and perform maintenance as needed.
What happens when my knock sensor goes bad?
Example since the combustion efficiency decreases when the ECM. Changes the ignition timing this will result in poor gas. Mileage. The fourth symptom is a knocking noise.
What is the most common problem with Honda CR-V?
Common problems with the Honda CR-V
- Electrical & Battery Drain (Across multiple generations)
- A/C / Climate Control Failures (Second–Third–Fifth generations)
- Transmission & Vibration (Fourth‑Gen 2012–2016 and Fifth‑Gen 2017–2018)
- Affected Models:
- Power Window Master Switch – Water Ingress Risk.
How much does it cost to replace a knock sensor on a Honda CR-V?
The average cost for a Honda CR-V Knock Sensor Replacement is between $240 and $374.
Can I fix a knock sensor myself?
Start by disconnecting your battery of the car. Then, take out any components that could be blocking the way, such as the intake manifold to gain access to the sensor. Then you'll need to remove the old sensor and replace it with the brand new sensor, and then connect everything.