AFR O2 Wideband Sensor Honda Civic FD 1.8 R18A2 36531-RNA-A01 AKAS

The AKAS Upstream AFR Wideband O2 Sensor is a precision 4-wire wideband air-fuel ratio (LSU-type) pre-catalytic converter (front) replacement for Honda Civic (FD) equipped with R18A2 1.8L petrol engines, replacing OE 36531-RNA-A01 (cross-ref Denso 234-9126).

PETROL ONLY. This upstream (pre-cat / Bank 1 Sensor 1 / Front / Front Upper) wideband AFR sensor measures exhaust oxygen concentration before the catalytic converter with wide-range linear accuracy, providing precise air-fuel ratio feedback to the ECU - critical for optimal combustion, fuel efficiency, power delivery, and emissions control on the R18A2 1.8L i-VTEC engine. Premium high-temperature construction with anti-carbon and anti-corrosion coating ensures long service life. Plug-and-play 4-pin OE connector. Backed by a 6-month limited warranty.

1. 4-Wire Wideband AFR - Precise Linear Air-Fuel Ratio Control This is a 4-wire wideband air-fuel ratio (LSU-type) sensor for the UPSTREAM (pre-cat / Bank 1 Sensor 1 / Front / Front Upper) position, measuring exhaust oxygen concentration with wide-range linear accuracy for precise air-fuel ratio feedback to the ECU. Essential for optimal combustion, fuel efficiency, power delivery, and emissions compliance on the R18A2 1.8L i-VTEC engine. Replaces OE 36531-RNA-A01 (cross-ref Denso 234-9126).

2. Exact OE Match - Honda Civic FD 1.8 R18A2 Only Precision upstream wideband AFR direct-fit sensor for Honda Civic (FD) 2006-2011 with R18A2 1.8L petrol engines, including DX, EX, LX, Coupe 2-Door, and Sedan 4-Door variants. 1:1 OE dimensions, 4-pin OE connector, M18x1.5 thread - no modification, splicing, or adapter needed. PETROL ONLY - not compatible with 2.0L (K20Z2) Type R, hybrid, or downstream (post-cat) position.

3. Fast Light-Off & Wideband Precision - Restores Performance & Clears CEL Integrated heating element brings the sensing element to operating temperature in under 20 seconds, ensuring accurate wide-range oxygen concentration readings even during cold starts and short urban trips. Fast-response wideband signal module transmits precise linear air-fuel ratio data to the ECU, restoring optimal combustion, improving fuel economy, restoring power and throttle response, and clearing check engine lights (P0130/P0131/P0132/P0133/P0134/P0171/P0174 series) caused by a faulty or ageing upstream AFR sensor.

4. Premium High-Temp Construction - Anti-Carbon, Long Lifespan Premium high-temperature alloy probe with oxidation-resistant outer shell delivers reliable performance under harsh exhaust conditions. Anti-carbon-build-up and anti-corrosion surface treatment resists erosion from hot exhaust fumes, carbon deposits, and oil/PCV impurities - significantly prolonging service life vs. uncoated cheap sensors that fail prematurely from carbon fouling. Waterproof/dust-proof integrated sealing and anti-vibration internal circuit ensure consistent performance.

5. OE Quality at Aftermarket Value - 6-Month Warranty Manufactured to strict OE specifications with dependable wideband detection accuracy, rapid signal feedback, solid high-heat tolerance, and anti-vibration capability - performing comparably to the Denso/NTK OE wideband AFR sensor (234-9126) at a fraction of Honda main dealer cost. Backed by a 6-month limited warranty covering manufacturing defects. For South African Honda Civic owners - where Honda Civic FD is a popular affordable sedan/coupe, and upstream AFR sensor failure is a common cause of poor fuel economy, rough idle, reduced power, and failed emissions/roadworthy tests.

Product Specifications

Product Type: AFR Air-Fuel Ratio Sensor / Wideband O2 Lambda Sensor (4-Wire)

Sensor Type: Wideband Linear (LSU-type / UEGO)

Position: Upstream / Pre-Catalytic Converter / Bank 1 Sensor 1 / Front / Front Upper

Primary OE: 36531-RNA-A01

Connector: 4-Pin OE-Matching (Plug-and-Play)

Mounting Thread: M18 x 1.5

Heating: Integrated Heater (Fast Light-Off)

Signal Output: Wideband Linear (0-5V / 0-5V linear AFR)

Operating Temperature: Up to 750 C+ (Exhaust)

Body: High-Temp Alloy Probe + Oxidation-Resistant Shell

Coating: Anti-Carbon & Anti-Corrosion

Sealing: Waterproof & Dust-Proof Integrated

Compatible Models - 1.8L PETROL ONLY

Honda:

- Civic (FD) (2006-2011) - R18A2 1.8L

- Includes: DX, EX, LX, Coupe 2-Door, Sedan 4-Door

Engine Compatibility

Engine Family: R18A2 (i-VTEC SOHC)

Displacement: 1.8L (1799cc) Inline-4 Petrol

Power: 103-104kW (140HP)

Fuel: Petrol Only

NOT compatible with: 2.0L (K20Z2) Type R

NOT compatible with: Hybrid (IMA)

NOT compatible with: Downstream (post-cat) position

Note: Verify original OE number and engine code before purchase.

OE Cross-Reference

Primary OE: 36531-RNA-A01

Cross-Reference: Denso 234-9126, 36531-RNA-J01, 36531-RZP-G01

Note: Verify original OE number, engine code, and sensor position (upstream vs downstream) before purchase.

1.8L PETROL ONLY - VERIFY COMPATIBILITY: This upstream wideband AFR sensor fits ONLY Honda Civic (FD) with R18A2 1.8L petrol engines (2006-2011), replacing OE 36531-RNA-A01 in the UPSTREAM (pre-cat / Bank 1 Sensor 1 / Front / Front Upper) position. NOT compatible with 2.0L Type R, NOT with hybrid, NOT for downstream (post-cat) position, NOT for other OE numbers. Check original OE number, engine code, and sensor position before purchase.

4-WIRE WIDEBAND AFR - DO NOT SUBSTITUTE NARROWBAND: This is a 4-wire wideband air-fuel ratio (LSU-type) sensor. Ensure the connector has 4 pins before installation. Do NOT substitute with a 1-3 wire unheated sensor or a standard 4-wire narrowband switching sensor - wideband AFR and narrowband O2 have different calibrations and signal outputs and will cause incorrect readings and persistent check engine lights. Upstream AFR (wideband) and downstream O2 (narrowband) sensors are NOT interchangeable.

UPSTREAM ONLY - DO NOT INSTALL IN DOWNSTREAM POSITION: This is an UPSTREAM (pre-cat / Bank 1 Sensor 1 / Front / Front Upper) wideband AFR sensor. Do NOT install in the downstream (post-cat / Bank 1 Sensor 2 / Rear) position - upstream and downstream sensors have different calibrations and connector types and are NOT interchangeable.

PROFESSIONAL INSTALLATION: Recommended for proper torque (30-45 Nm), correct cable routing away from heat sources and moving parts, and clearing of diagnostic trouble codes (DTCs) after replacement. Allow exhaust to cool completely (30-60 min) before servicing. Do not over-tighten. If the mounting bung thread is damaged or carbon-fouled, clean/repair before installation.

WARRANTY: 6-month limited warranty covering manufacturing defects under normal use. Does not cover improper installation, drops, contamination, water ingress, use on incompatible vehicles/engines, wrong position (downstream), modification, or normal wear. This is an aftermarket replacement part - not affiliated with or manufactured by Honda, Denso, or NTK.

What's in the box
1 x AKAS Oxygen Sensor OE 36531-RNA-A01 Compatible Honda Civic FD 1.8 2006-2011