Replacing a knock sensor on a 2015 Honda Accord typically runs about $200 to $500 in total, depending on engine type, where you have the work done, and local labor rates. This range reflects parts cost plus labor for a standard replacement at an independent shop; dealer pricing tends to be higher.
The 2015 Accord offered two main engines—the 2.4-liter inline-four and the 3.5-liter V6—each with its own access considerations. A failed knock sensor can trigger a check engine light and codes such as P0330, and replacing it usually involves accessing the sensor on the engine block or cylinder head, which can affect both part cost and labor time.
What is a knock sensor and why it fails
The knock sensor monitors detonation (uncontrolled combustion) in the engine and helps the engine control unit adjust ignition timing. If the sensor or its wiring fails, the ECU may pull timing or illuminate the check engine light. Common symptoms include engine pinging or knocking, reduced performance, rough idle, or decreased fuel economy. Causes range from sensor aging and wiring wear to physical damage from heat and vibration.
Replacement process overview
In general, replacing the sensor involves locating the knock sensor(s) on the engine, disconnecting the electrical connector, removing the old sensor, installing the new sensor, and clearing any codes. Access difficulty varies by engine variant; the 2.4L engine can be straightforward in some layouts, while the 3.5L V6 may require more disassembly or special tools. A technician may also inspect related wiring for damage during the job.
Cost estimates by engine and shop type
Prices vary by engine, shop type, and region. The following ranges reflect typical market values for common scenarios in the United States as of the most recent data available.
- Independent shop – 2.4L engine: parts roughly $60–$120; labor about 1–2 hours at $75–$120 per hour; total estimated $150–$360.
- Independent shop – 3.5L V6 engine: parts roughly $70–$150; labor about 1.5–2.5 hours at $80–$125 per hour; total estimated $190–$420.
- Honda dealership – either engine: parts roughly $90–$190; labor about 1.5–3 hours at $110–$180 per hour; total estimated $250–$550.
These figures assume a straightforward sensor replacement with typical access and do not include possible diagnostics fees or the cost of additional repairs if wiring or mounting hardware is damaged. If more work is needed to access the sensor, the price can rise.
What can affect cost
Several factors can push the price higher or lower than the base estimates. The following factors commonly influence final pricing:
- Engine variant (2.4L vs 3.5L) and access difficulty to the sensor
- Quality of parts (OEM vs aftermarket sensors)
- Regional labor rates and the shop’s pricing policy
- Need for additional repairs (e.g., wiring harness inspection or replacement, intake manifold removal)
- Diagnostic fees or whether the diagnostic is included in the estimate
Tip: Always request an itemized estimate that separates parts, labor, and any diagnostic charges before authorizing work.
How to get a precise quote
To obtain an accurate price for your specific 2015 Accord and engine configuration, follow these steps:
- Ask the shop to confirm the exact engine variant and which knock sensor is being replaced (there can be more than one).
- Request a written, line-item estimate that separates parts, labor, and any diagnostic or disposal fees.
- Compare at least two or three quotes from independent shops and, if possible, a dealer for reference.
- Inquire whether the quoted labor includes any intake or accessory removal required to access the sensor.
Certainty matters: a clear, itemized quote helps you avoid surprise costs if additional work is needed once the part is opened up.
Summary
For a 2015 Honda Accord, a knock sensor replacement typically falls in the $200 to $500 range, with variations driven by engine type, access difficulty, and whether you choose an independent shop or a dealer. Always seek multiple, itemized quotes and confirm whether diagnostic fees are included. If other issues are found during the repair, prices can rise accordingly. A proactive approach—understanding the specific sensor in your car and getting written estimates—helps you balance cost with reliable repair.