Parts for your 2007 Honda Fit-Oxygen sensor

2007 Honda Fit oxygen sensor — purpose, care, and when to replace

Yes, the 2007 Honda Fit absolutely uses oxygen-sensing technology. Technical sources including the 2007–2008 Honda Fit/Jazz Service Manual (Fuel & Emissions, PGM‑FI), Honda Technical Training on OBD‑II systems, and the vehicle’s emissions control description confirm it’s equipped with a primary air–fuel ratio (A/F) sensor before the catalytic converter and a secondary oxygen (HO2S) sensor after it. These sensors are essential for OBD‑II compliance and catalyst monitoring.

On this model, the front A/F sensor constantly measures oxygen content in the exhaust so the ECU can keep the mixture right on the money for efficiency, smooth running and low emissions. The rear O2 sensor watches how well the catalytic converter is doing its job. Together, they help the Fit sip petrol, run clean and avoid that annoying check engine light.

They’re not a scheduled replacement item, but they do age. Contamination from oil burning, coolant leaks, silicone sprays, or leaded fuel substitutes can slow sensor response. If the Fit starts using more petrol, idles a bit rough, hesitates on take‑off, or shows a CEL with codes like P0134, P0135, P0137, P0141 or P0420, the sensors and exhaust for leaks are worth a look.

• Signs it’s time: worse fuel economy, sluggish performance, sulphur smell, CEL with O2/A/F or catalyst codes, or failed emissions test.
• Good practice: fix any intake or exhaust leaks before the front sensor, keep the ignition system healthy to protect the cat and sensors, and use quality petrol.

When replacement’s needed, go for OEM‑equivalent Denso/NTK parts that match the exact connector and heater spec. “Universal” sensors can be false economy. Warm the engine briefly to help free a stuck sensor, use a proper O2 sensor socket, and avoid twisting the harness. Most new sensors come with the correct thread compound pre‑applied—don’t add extra anti‑seize unless the manufacturer says so. Tighten to the torque in the Honda manual, clip the loom back as routed, clear codes and perform an idle learn if the battery’s been disconnected. A healthy set of sensors can last well past 160,000 kilometres, but if the cat’s been replaced or the engine’s had contamination, doing both sensors can save a second visit.

How many oxygen sensors does a 2007 Honda Fit have?

It has two. The primary air–fuel ratio sensor sits before the catalytic converter and handles precise fuel control. The secondary oxygen sensor sits after the cat and monitors catalyst efficiency for OBD‑II.

What are the symptoms of a bad oxygen sensor on a 2007 Fit?

Common signs include higher fuel use, rough idle, hesitation, a sulphur or “eggy” smell, and the check engine light with codes such as P0134/P0135 (front sensor), P0137/P0141 (rear sensor), or P0420 (catalyst efficiency). A quick scan of fuel trims and sensor activity helps confirm.

How often should the oxygen sensors be replaced?

There’s no fixed interval. Many last 160,000 kilometres or more. Replace when faulty, contaminated, or when the catalytic converter is renewed. Using the correct OEM‑spec sensor and sorting any exhaust or intake leaks will keep them happy longer.