O2 Oxygen Sensor Upstream Downstream for Hyundai Sonata (2009-2010) 2.4L

Direct-Fit O2 Oxygen Sensor Kit for 2009-2010 Hyundai Sonata (NF)

What it Does: This upstream and downstream oxygen sensor kit regulates air-fuel ratios and monitors catalyst efficiency on the 2009-2010 Hyundai Sonata (NF) with the G4KC 2.4L engine.

The Stock Hyundai Sonata Sensor Failure

Factory zirconia sensors on the NF chassis G4KC 2.4L endure severe thermal shock and exhaust fouling over time. Repeated heat soak degrades platinum electrodes and fractures the ceramic element, while internal heater coils open from vibration. As response latency slows, the ECM loses accurate lambda feedback and commands rich fuel trims. This triggers P0130, P0133, P0135, and P0141 codes.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light: Stored codes like P0133, P0135, or P0141 from heater failure or slow switching.
• Rich Fueling: Skewed upstream voltage forces excess fuel delivery, hurting MPG and fouling spark plugs.
• Emissions Failure: Downstream drift causes P0420 false triggers, rough idle, and failed inspection readiness.

The Direct-Fit Zirconia Sensor Solution

Replacing both probes as a matched pair restores closed-loop fueling across bank 1 sensor 1 and sensor 2. Each unit features a laser-welded stainless housing, PTFE breather membrane, and fast-lightoff ceramic heater. Factory-length harnesses with OEM weatherproof plugs connect directly to the G4KC 2.4L loom without splicing. Direct fitment for 39210-2C210, 39210-2G200, 234-5029, and 234-4238 guarantees exact calibration.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2009 Hyundai Sonata 2.4L
• 2010 Hyundai Sonata 2.4L

Frequently Asked Questions & Fitment Warnings

Does this fit the NF Sonata?

Yes. Direct fit for 2009-2010 Hyundai Sonata models with the G4KC 2.4L engine. Excludes 3.3L V6 models and 2006-2008 trims; confirm engine before ordering.

Will this clear P0133, P0135, or P0141 codes?

Yes. New sensors eliminate heater and response faults like P0133, P0135, and P0141 when exhaust leaks and wiring faults are absent.

Are OEM connectors and anti-seize ready for install?

Yes. Pre-terminated OEM plugs and coated threads install directly; torque to 30 lb-ft with a 22mm socket.

The Hyundai Precision Standard

Engineered for strict emissions compliance and reliable ECM voltage accuracy on daily-driven NF sedans. Restored lambda control ensures clean combustion and CEL-free operation.