A-Premium APOS1395 O2 Oxygen Sensor Mid-Catalyst 4-Wire OEM Replacement 250241140

The A-Premium APOS1395 is a direct-fit aftermarket replacement O2 (oxygen) sensor engineered for Land Rover and Jaguar vehicles equipped with the AJ133 V8 engine. This sensor replaces OEM part number 250241140 and is designed for the mid-catalyst position — the third sensor on each bank, situated between the downstream sensor and the catalytic converter outlet. It features a 4-pin heated sensor design and is available in center, left, or right configurations.

The oxygen sensor continuously monitors unburned oxygen levels in the exhaust stream and transmits real-time data to the Engine Control Unit (ECU), enabling precise air-fuel mixture management. A failed or degraded O2 sensor can result in poor fuel economy, rough idle, reduced engine performance, and an illuminated Check Engine Light (CEL).

Key Features:

• Direct OEM replacement for part number 250241140
• 4-pin heated sensor configuration
• Mid-catalyst (center) position fitment
• Designed for Land Rover Range Rover, Discovery, and Jaguar applications
• Built to meet or exceed original equipment specifications
• Backed by A-Premium's 3-year unlimited mileage warranty
• Straightforward installation with standard hand tools

Replacing a worn or failed mid-catalyst oxygen sensor restores accurate exhaust monitoring, helps maintain catalytic converter efficiency, and supports emissions compliance. The A-Premium APOS1395 offers a reliable, cost-effective alternative to dealer-sourced OEM components.