Parts for your 2001 Nissan Bluebird-Knock sensor

2001 Nissan Bluebird knock sensor: fitment, purpose, and service tips

Based on the Nissan Factory Service Manual (EC section) for the U14 Bluebird and G10 Bluebird Sylphy (circa 2000–2002), plus Nissan FAST parts listings, the 2001 Nissan Bluebird is fitted with a knock sensor and monitors it via DTC P0325. Nissan parts catalogues list knock sensor part numbers used on this model family, including 22060-30P00 (SR20DE) and 22060-6N21A/22060-5V000 (QR/QG engines), confirming the sensor is relevant to the vehicle.

The knock sensor on a 2001 Bluebird is a small, bolt-on piezoelectric unit that “listens” for detonation (knock) in the engine block. When it detects that sharp, high-frequency vibration that comes with pinging, it signals the ECU to dial back ignition timing just enough to protect the engine. That lets the Bluebird run smoothly on everyday fuel, trim emissions, and keep performance tidy without risking piston or bearing damage.

It’s not a regular service item, but it’s worth a look whenever you’re under the bonnet for plugs, intake work, or coolant hoses—especially on higher‑kilometre cars. Common clues the sensor or its wiring is unhappy include a check engine light with P0325, dull performance, heavier fuel use, or persistent pinging under load. Because it lives low on the block (often under the intake, around cylinders 2–3 on SR/QR/QG engines), heat and age can make the sub‑loom brittle or the connector oily.

Replacement is straightforward but fiddly due to access. Many Bluebirds need the intake manifold or runners moved to reach the sensor. Plan on:

• Disconnecting the battery and removing intake components for access.
• Inspecting and, if needed, replacing the knock sensor sub‑harness.
• Cleaning the block’s mating spot, install the sensor dry (no grease) and torque to the factory spec (around 20 N·m for many Nissans—check the FSM for your exact engine).
• Clearing codes and verifying with a scan, most ECUs relearn on their own, though an idle/air volume learn may help after intake work.

Sticking with a genuine or quality OEM‑equivalent sensor is smart, cheap copies can be deaf or noisy. Running the recommended octane (91–95 RON depending on engine and market) helps the ECU and knock sensor keep timing right where it should be. If access is tight, it’s efficient to bundle the job with intake gasket or hose replacements to save on labour.

Where is the knock sensor on a 2001 Bluebird?

On SR, QR, and QG engines used in 2001 Bluebirds, the knock sensor is bolted to the engine block under the intake side, typically between cylinders 2 and 3. Access usually requires removing or shifting the intake manifold or runner assembly. A torch and a small mirror make identification easier, look for a single two‑pin connector leading to a round, doughnut‑style sensor.

Is it safe to drive with a faulty knock sensor?

Short term, the ECU will play it safe by pulling timing, which prevents knock but leaves the car feeling flat and thirstier. Long term, it’s not ideal: you can mask real detonation issues, risk higher emissions, and potentially stress the engine if the fault is intermittent. Best to fix the sensor or wiring promptly.

Do I need any programming after replacing the sensor?

No special coding is required for most 2001 Bluebirds. Clear the fault code, check for live knock feedback if your scan tool supports it, and take a test drive. After any intake removal, performing an idle air volume learn can help stabilise idle, but it’s not mandatory for the knock sensor itself.