Oxygen sensors

Part of Engine sensors · about $320 to replace

What it is

Wide-band lambda sensor before, narrow-band after each catalyst.

What it does

Report mixture so the ECU can trim fuel and monitor the cats.

How it fails

Slow response after 150,000 km; replace in pairs.

Material	Zirconia element, heater
Spec	Heater 12 W
	response 100 ms

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