Parts for your 2001 Daihatsu Gran move-Oxygen sensor

2001 Daihatsu Gran Move Oxygen Sensor (Lambda Sensor)

Technical sources confirm the 2001 Daihatsu Gran Move is fitted with a heated oxygen sensor (HO2S). The Daihatsu Gran Move/Pyzar Workshop Manual (Engine Control Systems, 1996–2002), Autodata Service & Repair (Emissions section), NGK/NTK Oxygen Sensor Catalogue, and Bosch ESI[tronic] application data all list a 4‑wire zirconia lambda sensor in the exhaust for the 1.3 and 1.5 EFI petrol engines. Some markets show a single upstream sensor, others add a downstream sensor after the catalytic converter for catalyst monitoring.

On this Gran Move, the oxygen sensor constantly measures the oxygen content in exhaust gases and helps the ECU trim the air–fuel mixture. That keeps fuel economy tidy, tailpipe emissions low, and the catalytic converter happy. When the sensor is healthy, cold starts are cleaner, throttle response is smoother, and the cat is protected from over‑rich mixtures that can overheat it.

As part of regular servicing, it’s smart to treat the O2 sensor as a wear item. Narrowband zirconia sensors typically lose accuracy with age, silicone or oil contamination, or heater failure. Many workshops recommend testing or replacing around 100,000–160,000 km, or sooner if there’s a check‑engine light, failed emissions/WOF, or obvious fuel usage spikes.

• Common signs it’s tired: increased fuel consumption, rough idle, sooty tailpipe, sulphur smell, sluggish performance, MIL illuminated.
• Quick checks: scan for fault codes, confirm closed‑loop operation at hot idle, view sensor switching on live data, and verify heater circuit integrity.

Replacement is straightforward with the right tools. Use an O2 sensor socket, let the exhaust cool to safe touch, and pre‑treat threads with penetrating oil. Many new sensors are supplied with thread compound, if not, apply a small amount of high‑temp, sensor‑safe anti‑seize to the threads only. Tighten to the workshop‑specified torque (commonly around 35–45 N·m, confirm for the specific engine), keep the harness away from heat and moving parts, and avoid twisting the lead. After installation, clear codes and allow the ECU to relearn trims with a decent road drive.

Note: Most 2001 Gran Moves in AU/NZ have one upstream sensor, certain variants can also carry a post‑cat sensor. If unsure, confirm by VIN or a visual check of the exhaust.

Popular questions about the 2001 Daihatsu Gran Move oxygen sensor

How many oxygen sensors does a 2001 Gran Move have?
Most Australian and New Zealand vehicles have a single upstream sensor in the exhaust manifold. Some markets and engine variants add a second, downstream sensor after the catalytic converter for monitoring. A quick visual check of the exhaust or a VIN‑based parts lookup will clarify your exact setup.

What symptoms point to a failing oxygen sensor on a Gran Move?
Expect higher fuel use, rough or hunting idle, a sootier tailpipe, occasional hesitation, and an engine light. Emissions tests can also show elevated CO/HC. If the heater fails, the ECU may stay in open loop longer, making cold running richer than it should be.

When should the oxygen sensor be replaced?
Plan inspection or replacement around 100,000–160,000 km, or any time you see the warning signs. If the catalytic converter has been replaced after a failure, it’s wise to fit a fresh upstream sensor to protect the new cat and restore correct fuelling.