NGK 25190 Oxygen Sensor Direct Fit Downstream Heated O2 Sensor

The NGK 25190 oxygen sensor (also called an O2 sensor or air-fuel ratio sensor) is a direct-fit, heated, downstream sensor. It is made to OE specifications by NTK, the NGK Group's sensor brand. It monitors exhaust gas composition and reports to the engine control unit (ECU), which uses the signal to keep the air-fuel mixture correct. This helps the catalytic converter work efficiently, lowers emissions and supports good fuel economy.

Key Features:

• Direct-fit design for a specific application, with OE-specified connector and harness
• Downstream position (B1S2)
• Heated, narrow-band switching zirconia sensor type
• Dual-coated platinum interface and a thinner ceramic element for fast light-off and response
• 3-stage contaminant-resistant overcoat protects the element from poisoning
• Water-resistant connector helps prevent moisture-related failures
• Vibration and thermal shock tested during development

Specifications:

• Manufacturer part number: 25190 (UPC 087295251904)
• Wire/terminal quantity: 4
• Wiring harness length: 12 in (305 mm)
• Hex/wrench size: 7/8 in (22 mm)
• Metric thread

Cross-references: Replaces Bosch 15149, Delphi ES20154, DENSO 234-4288, Spectra Premium OS5456, ACDelco 213-4248, CARQUEST 75-3699, GM 96419956, Suzuki 1821384Z20 and Standard Motor Products SG1638.

A worn oxygen sensor can cause poor fuel economy, rough running and a check engine light. Replacing it with a quality OE-style sensor helps restore efficient engine management and emissions performance.