Walker Products Oxygen Sensor P/N:250-21051
Walker Products 250-24733 oxygen sensor for the 2000-2003 Chevrolet Astra 4-cylinder 1.8L reads the oxygen in the exhaust gas to track combustion efficiency. The Walker Products oxygen sensor is a 4-wire, narrow-band, direct-fit unit made for its specific application and upstream position, and it returns the diagnostic feedback the ECU expects.
A failing sensor can show up as a poorly running engine, higher fuel consumption or a lit malfunction indicator light. The wiring harness and connector can be behind the same signs, so look both over for physical damage before you replace the sensor.
It fits the 2000-2003 Chevrolet Astra 4-cylinder 1.8L, which takes one upstream sensor. This listing is a single sensor.
Fit and size
Build and materials
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Is this a direct-fit oxygen sensor for the 2000-2003 Chevrolet Astra 4-cylinder 1.8L?
Yes. Walker Products 250-24733 is a direct-fit upstream sensor for the 2000-2003 Chevrolet Astra 4-cylinder 1.8L, and that engine takes one.
Is this upstream oxygen sensor narrow-band or wideband?
Narrow-band. This sensor has four wires and a direct-fit design, and it measures the oxygen content of the exhaust gas to monitor the air-fuel ratio.
What does the coating on this oxygen sensor protect against?
The coating protects the electrode surfaces from contamination and erosion by combustion residue and particulates in the exhaust gases. The electrodes are made of a gas-permeable platinum layer.
How can I tell if my upstream oxygen sensor is going bad?
The engine can run poorly, fuel consumption can rise, or the malfunction indicator light can come on. Newer vehicles store fault codes in the ECU, and some relate to the sensor.
What thread size does the Walker Products 250-24733 use?
The sensor is threaded, and its thread size is M18 - 1.5.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.