NGK 21527 NTK OE Type Oxygen Sensor, Heated Zirconia, M18x1.5

The NGK 21527 NTK oxygen sensor (also called an O2 sensor or lambda sensor) monitors the oxygen content of the exhaust gas. It sends voltage signals to the engine computer, which uses them to regulate the air/fuel ratio for efficient combustion, lower emissions and better fuel economy. NTK is the oxygen sensor brand of NGK Spark Plugs and supplies sensors to automakers as original equipment.

Key Features:

• Highly sensitive zirconia sensing element for fast response
• Heated sensor with a ceramic heater
• Narrow band sensor type with 4 wires
• OE style connector and wiring harness included, for easy installation
• Thread size M18 x 1.5 mm, screw-on mounting
• Wire length of about 450 mm (17.75 in.)
• Pin terminal type, no grommet included
• Built to meet or exceed emission standards
• Backed by a limited 1-year warranty

OEM Cross-References: 91177407, 91177409, 1821350G01, 1821365D02

A new oxygen sensor helps restore proper fuel control, supports engine performance and helps protect the catalytic converter. Check the sensor position (upstream or downstream, bank 1 or bank 2) before you install it.