O2 Oxygen Sensor Upstream Downstream for Land Rover Range Rover Range Rover Sport (2014-2019) 3.0L 5.0L Supercharged

Direct-Fit Upstream & Downstream O2 Oxygen Sensor Kit for 2014-2019 Land Rover Range Rover,Range Rover Sport (L405 / L494)

What it Does: This 6-piece upstream, mid-catalyst, and downstream oxygen sensor kit restores closed-loop air-fuel metering and catalyst monitoring for 2014-2019 Land Rover Range Rover and Range Rover Sport (L405/L494) supercharged models.

The Stock Land Rover Range Rover,Range Rover Sport Sensor Failure

Factory oxygen sensors on the L405 and L494 platforms with AJ126 3.0L V6 and AJ133 5.0L V8 supercharged engines endure severe exhaust gas temperatures and thermal cycling. Over time, carbon fouling, silicone contamination, and heater circuit burnout degrade zirconia response and fracture internal ceramic elements. Lazy upstream switching triggers P0135, P0155, or fuel trim faults like P0171 and P0174, forcing rich open-loop operation.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: Triggers heater circuit codes (P0135/P0155), slow response faults, or catalyst efficiency codes (P0420/P0430).
• Erratic Fuel Trims: Sluggish voltage switching skews ECU fuel trims, causing rough idle and hesitation under supercharger boost.
• Excessive Fuel Consumption: Rich open-loop fueling washes down cylinder walls, overheats catalytic substrates, and fails emissions tests.

The Direct-Fit Zirconia Oxygen Sensor Solution

This matched 6-sensor kit replaces all bank 1 and bank 2 upstream, mid-catalyst, and downstream sensors simultaneously to eliminate cross-bank voltage lag. Constructed with corrosion-resistant stainless steel shells, dual protective shields, and fast-lightoff planar zirconia elements, each sensor resists thermal shock and moisture intrusion. Factory-keyed connectors and anti-seize coated threads match OE specifications for 234-5156, 234-4791, and 234-4794 without splicing.

What's Included

• 2x Upstream Oxygen Sensors
• 2x Mid-Catalyst Oxygen Sensors
• 2x Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2014-2019 Land Rover Range Rover (L405) 3.0L V6 Supercharged (AJ126)
• 2014-2019 Land Rover Range Rover Sport (L494) 3.0L V6 Supercharged (AJ126)
• 2014-2018 Land Rover Range Rover (L405) 5.0L V8 Supercharged (AJ133)
• 2014-2018 Land Rover Range Rover Sport (L494) 5.0L V8 Supercharged (AJ133)
• Exclusions: Naturally aspirated 5.0L, diesel, and 2019 5.0L V8 Supercharged applications are not listed.

Frequently Asked Questions & Fitment Warnings

Does this fit the L405 / L494 Range Rover,Range Rover Sport?

Yes. This is a direct fit for the 2014-2019 Land Rover Range Rover,Range Rover Sport equipped with the AJ126 3.0L V6 Supercharged engine and 2014-2018 models with the AJ133 5.0L V8 Supercharged engine. Naturally aspirated 5.0L, diesel, and 2019 5.0L Supercharged models are excluded; confirm your engine before ordering.

Will this clear P0135, P0171, and P0420/P0430 sensor codes?

Yes, when triggered by worn O2 sensors. Replacing all six sensors restores accurate air-fuel and post-catalyst monitoring for 234-5156, 234-4791, and 234-4794 positions. Clear ECU fault memory and verify no exhaust leaks remain.

Are harnesses plug-and-play for installation?

Yes. Each sensor includes OE-length wiring and factory connectors for direct installation. Thread into clean exhaust bungs and torque to specification.

The Land Rover Precision Standard

European supercharged engines depend on rapid closed-loop lambda feedback to protect catalytic substrates and maintain peak efficiency. Replacing all six sensors as a matched set restores factory ECU precision and CEL-free operation.