Parts for your 2001 Daihatsu Yrv-Knock sensor

2001 Daihatsu YRV knock sensor — purpose, checks and replacement tips

Technical sources show the 2001 Daihatsu YRV (M200/M201/M211 series) with the K3‑VE and K3‑VET 1.3‑litre engines is factory‑fitted with a knock sensor. References: Daihatsu YRV Service Manual (Engine Control System, Knock Sensor section, 2000–2005), Daihatsu Electronic Parts Catalogue listing “Sensor, Knock” for YRV M201G (e.g., part numbers commonly cited as 89615‑97201 / 89615‑97401), and Daihatsu OBD‑II diagnostics that include DTCs P0325/P0330 for knock sensor circuits. So, for a 2001 Daihatsu YRV, the knock sensor is relevant and used.

On this YRV, the knock sensor listens for detonation (“pinging”) and lets the ECU trim ignition timing to keep the engine safe and smooth. That means better driveability on Aussie and Kiwi roads, decent fuel economy, and a healthy margin of protection if the fuel quality isn’t perfect or the engine’s working hard on a hot day.

When the sensor isn’t happy, the ECU often throws the check‑engine light and drops timing into a safer map. Expect flatter performance, higher fuel use, and possibly a rattly ping under load if timing control can’t keep up. Common codes are P0325 (sensor circuit fault) or related range/performance faults.

There’s no routine service interval for the knock sensor, but it’s smart to give it a once‑over during major services—especially on higher‑kilometre YRVs. The unit is typically mounted on the engine block beneath the intake side, heat, oil soak, or a brittle sub‑loom can cause dramas over time.

• Signs it may need attention:
  • Check‑engine light with knock‑sensor codes
  • Noticeable loss of pep, rough running under load
  • Poorer fuel economy or audible pinging
• Replacement pointers:
  • Disconnect the battery and let the engine cool
  • Clean the sensor’s mating pad on the block—no sealant or tape
  • Tighten to the workshop‑manual torque using a torque wrench
  • Route the harness clear of heat and sharp edges, inspect/replace the sub‑loom clip if brittle
  • Clear codes and perform an ECU relearn/drive cycle
• Prevention tips:
  • Use quality petrol from reputable brands
  • Keep the cooling system and intake tract in good nick
  • Avoid lugging the engine at low revs in high gears

For parts, stick with genuine or high‑quality aftermarket to ensure the sensor’s resonance and calibration match the K3 engine’s needs. Following the manual for torque and test procedures keeps the piezo element happy and the ECU reading accurate.

Popular questions

Does a 2001 Daihatsu YRV have a knock sensor?
Yes. The K3‑VE and K3‑VET engines in the 2001 YRV use a block‑mounted knock sensor that feeds the ECU so it can adjust ignition timing and prevent detonation.

Where is the knock sensor on a 2001 YRV?
It’s typically on the engine block on the intake side, beneath the manifold area. Access often requires removing intake ducting and working by feel, a mirror and good lighting help.

Can you drive with a faulty knock sensor?
It’ll usually run, but the ECU may pull timing, so it feels sluggish and can use more fuel. It’s best to fix it promptly—ignoring it risks engine knock going undetected under heavy load.