Autopapyrus · Honda Freed 1.5 (2022)
https://autopapyrus.com/guides/honda/freed/front-air-fuel-a-f-sensor-replacement-upstream-of-the-catalytic-converter/
https://autopapyrus.com/guides/honda/freed/front-air-fuel-a-f-sensor-replacement-upstream-of-the-catalytic-converter/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.
Honda Freed 1.5 (2022): Front Air/Fuel (A/F) Sensor Replacement (Upstream of the Catalytic Converter)
The front sensor is mounted in the exhaust manifold or in the front pipe ahead of the catalytic converter, and it provides the data used to control the air-fuel mixture. Typical signs of wear: the Check Engine light is on, codes for the A/F sensor circuit or heater (P0130-P0141 group, P2195-P2198, P0171/P0172), fuel consumption rises, and the idle is unstable. A step-by-step procedure for this model and engine is not documented in publicly available service materials. Below is the general principle for a Honda with an A/F sensor, so confirm the sensor's location visually.
Part
| № | Part | Alternatives |
|---|---|---|
| 01 | Front (upstream) A/F sensor, wideband, 4-wire, for Honda Freed 1.5 (L15B)same connector and wire length; preferably with a ready-made connector | Denso, NGK |
Tools
7- 22 mm oxygen sensor socket (slotted for the wire), or a 22 mm open-end or adjustable wrench
- ratchet with extension
- penetrating oil (such as WD-40)
- wire brush
- gloves
- torque wrench
- OBD scan tool for clearing codes
Step by step
13 steps- Make sure the sensor is actually at fault: read the trouble codes and look at the live A/F data (voltage or current, fuel trims). Also check for exhaust leaks and for the condition of the wiring.
- Shut the engine off and let it cool to a warm state (about 40-50 °C). The threads are tighter on a cold engine, and there is a risk of burns on a hot one.
- Disconnect the negative battery terminal.
- Locate the sensor: it is threaded into the exhaust manifold or the front pipe ahead of the catalytic converter. Access may require removing the plastic engine undercover or the manifold heat shield. If there is not enough room from above, raise the vehicle on a lift or ramps and place it on secure stands.
- Trace the wire from the sensor to its connector, press the locking tab, and disconnect the plug. Free the wire from the clips and holders, and note how it is routed.
- Heat the threaded joint (if needed) and treat it with penetrating oil, then wait 10-15 minutes.
- Fit the special 22 mm socket and unscrew the sensor counterclockwise. Do this smoothly, without jerking, so you do not damage the threads in the manifold. If it will not turn, add more oil and rock the sensor back and forth about 1/8 turn.
- Inspect the mounting boss and, if necessary, clean the threads in it with a brush or a thread chaser of the correct size. Do not let dirt get inside the exhaust.
- A new sensor usually comes with heat-resistant compound already applied to the threads. If it does not, use only an anti-seize compound approved for oxygen sensors, and keep it off the sensing tip. Silicone and ordinary greases must not get on the tip.
- Thread the sensor in by hand until it stops, to avoid cross-threading, then tighten it with a torque wrench. The typical torque for sensors with an M18x1.5 thread is in the range of 40-50 N·m (30-37 lb-ft). Check the exact value against the manufacturer's specification.
- Route the wire through the factory clips so it does not touch hot exhaust parts, and connect the plug until it clicks.
- Reconnect the battery, clear the codes with the scan tool, start the engine, and let it warm up to operating temperature. Make sure the Check Engine light does not come on and that there is no exhaust leak at the sensor.
- Take a 10-15 minute test drive in varied driving conditions and check the fuel trims and the sensor's operation in the live data.
Common mistakes and warnings
- Do not confuse the front A/F sensor (wideband, upstream of the catalytic converter) with the rear sensor, which is located after the catalytic converter and has a different type and connector
- Do not use an impact wrench and do not apply excessive force: the threads in aluminum or cast iron can be stripped
- Work under the vehicle only when it is on secure stands, and never get under it if it is supported only by a jack