Parts for your 2010 Nissan Serena-Knock sensor

2010 Nissan Serena knock sensor — what it does and when to sort it

The 2010 Nissan Serena is fitted with a knock sensor. This is confirmed in Nissan’s Factory Service Manual for the C25/C26 Serena with the MR20DE 2.0 petrol engine (EC section lists the Knock Sensor and DTC P0325), the CONSULT-III/III Plus diagnostic workflow that includes KS checks, and Nissan’s electronic parts catalogue (FAST), which lists a block-mounted knock sensor for 2010 Serena MR20DE variants (common supersessions include 22060-EN200 and 22060-1KT0A, always verify by VIN). So yes, it’s relevant and very much used on this model.

The knock sensor’s job is to “listen” for detonation (pinging) in the combustion chambers. It’s a piezoelectric microphone bolted to the engine block beneath the intake manifold. When it hears knock, the engine computer trims ignition timing and, if needed, enriches the mixture. That protects the engine from damage while keeping power and fuel economy tidy on Aussie and Kiwi fuel grades.

On a healthy Serena, the knock sensor quietly keeps things in check, especially on hot days, steep climbs, or when running 91 RON. If the sensor or its wiring fails, expect a check engine light with code P0325, lazier performance, and higher fuel use. In the worst case, genuine knock could go unreported, risking piston or ring land damage if the ECU can’t manage it properly.

Nissan doesn’t list the knock sensor as a routine service item, but it’s smart to give it some attention during major services. A technician should visually check the harness for oil soak, heat hardening, or cracked insulation, and ensure the connector is clean and clipped firmly. If there’s a fault code, test the sensor’s resistance and signal, and inspect the block’s mounting face.

Replacement is straightforward for a pro and moderate for a DIYer with patience: disconnect the battery, gain access under the intake manifold, remove the old sensor, clean the pad, and torque the new unit correctly. For MR-series engines the factory torque is typically about 22 N·m, over-tightening can skew readings. Use a quality sensor (genuine or a reputable aftermarket equivalent) and route the loom away from high electrical noise. After refit, clear codes with a scan tool and complete a drive cycle so the ECU relearns knock control.

A few handy tips under the bonnet:

• Run good-quality fuel, if it pings on 91, consider 95 RON.
• Don’t ignore a rattle under load, sort the cause early.
• If you see P0325 plus rough idle, also check earths and intake leaks.

Where is the knock sensor on a 2010 Nissan Serena?

It’s mounted on the engine block, central and low under the intake manifold—roughly beneath the throttle body area on the MR20DE. Access is usually from above with the manifold and its brace out of the way, or from underneath with extensions if you’re nimble. A mirror and good lighting help heaps.

Can it be driven with a faulty knock sensor?

You can usually drive, because the ECU falls back to a safer timing map, but you’ll notice softer performance and extra fuel use. If the engine actually starts to knock, the ECU may not respond properly, so it’s best to fix the fault promptly to protect the motor.

Do I need to reset anything after replacing the sensor?

Clear the fault codes with a scan tool and take it for a mixed drive so the ECU can relearn. Battery disconnects don’t always wipe pending codes or adaptations. If available, use CONSULT or a capable OBD tool to confirm no new knock-related counts are building up and that timing advance looks normal.