Air Fuel Ratio Sensor Upstream And Downstream Kit for Jeep 4.0L Cherokee Wrangler
Upgrade your Jeep’s fuel management with a complete Air Fuel Ratio (AFR) sensor set for the 4.0L engine family. The Jeep Cherokee Wrangler 4.0L Air Fuel Ratio Sensor Upstream, Downstream kit includes both upstream and downstream AFR sensors, engineered to monitor and optimize the air–fuel mix for superior performance, efficiency, and emission compliance. The upstream sensor reads before the catalytic converter to inform the engine control unit about the exhaust composition, while the downstream sensor confirms catalytic converter efficiency, helping your vehicle maintain peak combustion control and smoother idle. Specifically designed for 1996–1999 Jeep Cherokee, Grand Cherokee, and Wrangler 4.0L models, this pair restores accurate AFR readings and improves throttle response, fuel economy, and overall drivability.
Part numbers and compatibility you can trust
Upstream: 234-4076 with OEM numbers including ES20043, 2131375, 2131371, 4606421, 4606620, 4686222, 5269744, 56041212 and related variants.
Downstream: 234-4078 with OEM numbers including SG1695, SG1820, 5033081AA, 56041056, 56041219, 13138 13440, 2344078, 23088 and related variants.
What’s included
- 2 sensors included (Upstream and Downstream)
Benefits & Tips
- Restore EFI stability and efficiency: Accurate AFR readings help the engine run consistently, improving throttle response and fuel economy on 4.0L Jeeps.
- Improve emissions performance: Properly functioning AFR sensors ensure the catalytic converter operates correctly, helping you meet emissions standards.
- Practical maintenance advice: When replacing AFR sensors, inspect related wiring and connectors for wear and clean or replace as needed to maximize sensor life.
Product specifications
- Sensor type: Magnetic Induction
- Sensor construction: Heating Type
- Measuring range: Upstream & Downstream
- OEM numbers: 234-4076 (Upstream), 234-4078 (Downstream)
- Part numbers (examples): Upstream variants ES20043, 2131375, 2131371, 4606421, 4606620, 4686222, 5269744, 56041212; Downstream variants SG1695, SG1820, 5033081AA, 56041056, 56041219, 13138 13440, 2344078, 23088, SG466
- Origin: Mainland China
- Model coverage: Jeep Cherokee Wrangler 4.0L (1996–1999) including Cherokee, Grand Cherokee and Wrangler variants listed in the fitment notes
- Repeatability: For Jeep Cherokee Wrangler 4.0L 1996–1999
- Warranty: 1 YEAR (Replacement Warranty)
- Notes: Before ordering, please check product pictures, accessories, and part numbers. If you are unsure, please send us a product picture or part number before ordering.
Warnings/Reminders
- Before ordering, please check product pictures, accessories, and part numbers.
- If you are unsure, please send us a product picture or part number before ordering.
- To avoid wrong orders, read the purchase guide carefully. Thank you!
Warranty and certification
All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.
Trust and reliability
Providing quality and trusted service since 2002 at intercyprus.com.