O2 Oxygen Sensor Upstream Downstream for Honda Accord (1995-1997) 2.7L

Direct-Fit Upstream & Downstream O2 Oxygen Sensor Kit for 1995-1997 Honda Accord (CE6)

What it Does: This matched upstream and downstream oxygen sensor kit restores closed-loop air-fuel ratio control and catalyst monitoring on the 1995-1997 Honda Accord CE6 powered by the C27A4 2.7L V6 engine.

The Stock Honda Accord O2 Sensor Failure

Factory narrowband sensors on the CE6 chassis with the C27A4 2.7L V6 suffer severe exhaust thermal cycling and carbon buildup over high mileage. As the zirconia element ages, slow voltage switching delays ECM fuel trim corrections while degraded heater windings spike internal resistance. Oil or coolant contamination further fouls the platinum electrodes, triggering P0133, P0135, and P0141 fault codes.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light & Heater DTCs: Fatigue in the heater circuit or sensing cell triggers P0135, P0141, or P0133 slow-response codes.
• Fuel Trim Drift & Rich Running: Sluggish millivolt switching forces rich open-loop fueling, causing foul exhaust odors and P0171/P0172 trim faults.
• Emissions & MPG Loss: Inaccurate post-cat feedback induces false P0420 catalyst codes, failed smog tests, and reduced highway economy.

The Direct-Fit Zirconia Oxygen Sensor Solution

This matched upstream and downstream kit restores accurate air-fuel feedback using OEM-grade 4-wire heated zirconia ceramics. Laser-welded stainless housings block exhaust moisture intrusion while factory-keyed weatherpack plugs eliminate wiring splices during installation. Precision 0.1V–0.9V signal response and calibrated heater resistance meet 250-24099, 250-24601, 234-4096, and 234-4099 specifications for clean closed-loop operation.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 1995 Honda Accord 2.7L V6 (1 Upstream & 1 Downstream)
• 1996 Honda Accord 2.7L V6 (1 Upstream & 1 Downstream)
• 1997 Honda Accord 2.7L V6 (1 Upstream & 1 Downstream)

Frequently Asked Questions & Fitment Warnings

Does this fit the CE6 Accord?

Yes. This is a direct fit for the 1995-1997 Honda Accord equipped with the C27A4 2.7L V6 engine. Excludes 4-cylinder Accord models, 1998-2002 3.0L V6 Accord models, and 1997-1999 Acura CL 3.0L models; confirm engine before ordering.

Will replacing both sensors clear P0135, P0141, or P0420 codes?

Yes, for sensor faults. Installing fresh 234-4096 and 234-4099 sensors clears P0135/P0141 heater and slow-response codes, though a P0420 caused by a fractured catalytic converter core still requires converter service.

Is wire splicing or special prep required for installation?

No splicing required. Both units use OEM-style connectors and thread straight into factory exhaust bungs; lightly coat threads with anti-seize while avoiding the sensor tip.

The Honda Precision Standard

Replacing upstream and downstream sensors as a matched pair restores ECM fuel control and throttle response on your C27A4 2.7L V6. Built for thermal stability, this kit keeps your CE6 Accord emissions-compliant and CEL-free.