O2 Oxygen Sensor Upstream Downstream for Honda Accord (2008-2012) 3.5L

Direct-Fit Upstream & Downstream O2 Sensor Kit for 2008-2012 Honda Accord (CP3/CS2)

What it Does: This 4-piece sensor kit restores air-fuel monitoring and catalyst feedback on 2008-2012 Honda Accord (CP3/CS2) J35Z2 / J35Z3 3.5L V6 engines.

The Stock Honda Accord Oxygen Sensor Failure

Factory oxygen sensors on the CP3/CS2 Accord equipped with the J35Z2 / J35Z3 3.5L V6 endure severe exhaust heat soak and oil vapor fouling. Over time, zirconia ceramic elements crack from thermal shock while internal heater filaments burn out and platinum electrodes suffer silicone poisoning. This degradation causes sluggish millivolt switching, skewed fuel trims, and fault codes like P0134, P0154, P0141, and P0161.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: Triggers P0134, P0154, P0141, P0161, or P0171.
• Carbon Fouling: Ash coats the sensing tip, delaying voltage switching.
• Rich Running: Forces open-loop fueling, causing rough idle and failed emissions.

The Direct-Fit Oxygen Sensor Solution

Engineered to replace OEM numbers 234-5098, 234-4461, 36542R70A01, 36542R71L01, 36532RN0A01, and 226A0-JA10C, this matched 4-sensor set restores closed-loop ECU calibration across Bank 1 and Bank 2. Laser-welded stainless housings, high-temp ceramic elements, and fast-acting internal heaters ensure rapid light-off and accurate signal voltage. Factory weatherproof connectors and OEM-length harnesses bolt into stock bungs with zero splicing.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2008-2010 Honda Accord 3.5L (Automatic Transmission without California Emissions)
• 2008-2010 Honda Accord 3.5L (Manual Transmission with California Emissions)
• 2011-2012 Honda Accord 3.5L (Confirm Engine Before Ordering)

Frequently Asked Questions & Fitment Warnings

Does this fit the CP3/CS2 Accord?

Yes. Fits 2008-2012 Accord CP3/CS2 J35Z2 / J35Z3 3.5L V6. 2008-2010: Automatic without California emissions or Manual with California emissions only.

Will this clear P0134/P0141/P0154/P0161 codes?

Yes. Resolves O2 heater and response codes (P0134, P0154, P0141, P0161) once ECU memory is cleared.

Are connectors and threads ready for installation?

Yes. Sensors include OE weatherproof connectors; apply anti-seize only to threads—never the tip—and torque to spec.

The Honda Precision Standard

Engineered for JDM exhaust flow efficiency and accurate ECU feedback, this matched set restores crisp throttle response and emissions compliance.