How much does it cost to fix P0135 on a Honda?

Repair costs for P0135 on Honda vehicles typically range from $120 to $350 depending on the underlying cause. The most common fix is: A degraded heater element inside the upstream (Bank1 Sensor1) oxygen sensor, common as Honda's primary O2 sensors age past the 100,000-mile mark..

Honda Check Engine Code

P0135 on Honda

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

Severity: low DIY difficulty: 2/5 Honda cost: $120–$350

Last updated April 30, 2026 Also covers: Acura

P0135 on Honda: what makes it different

P0135 (O2 Sensor Heater Circuit, Bank 1 Sensor 1) is a frequent find on higher-mileage Hondas because the upstream oxygen sensor sits close to the exhaust manifold, where heat cycling wears out the heater element and nearby wiring over time.

Most-affected engines

K24 2.4L (Accord, CR-V)
L15B7 1.5L Turbo (Civic, CR-V)
J35 3.5L V6 (Pilot, Odyssey)

Common model years: 2008–2017

Most likely cause on Honda

A degraded heater element inside the upstream (Bank1 Sensor1) oxygen sensor, common as Honda's primary O2 sensors age past the 100,000-mile mark.

Known Honda engine-family issues

Because the Bank1 Sensor1 O2 sensor on many Honda engines sits in a tight, high-heat area near the exhaust manifold, the wiring insulation can become brittle and crack well before the sensor itself fully fails, which is a frequent root cause separate from the sensor.

Honda-specific causes (most common first)

Aging primary O2 sensor with a failed internal heater element
Wiring harness insulation cracked or chafed from prolonged exhaust manifold heat exposure
Corroded or loose connector pins at the sensor plug
Blown fuse feeding the O2 heater circuit
PCM-side heater driver fault (less common)

Honda-specific diagnostic tip

With the engine off, check resistance across the O2 sensor heater terminals against Honda's spec; then with the engine running, probe heater circuit voltage at the connector — if voltage is present but resistance is out of range, the sensor is bad, but if voltage is missing, trace the harness near the manifold heat shield for chafing.

Symptoms drivers report

Check engine light
Slower warm-up period where the car runs in open loop longer
Slight fuel economy hit on short trips

Typical repair cost on Honda

Most Honda owners fix P0135 for between $120 and $350, depending on which underlying cause turns out to be at fault. Start with the most-likely cause for your vehicle — A degraded heater element inside the upstream (Bank1 Sensor1) oxygen sensor, common as Honda's primary O2 sensors age past the 100,000-mile mark. — before throwing parts at it.

Honda P0135 FAQ

Does P0135 mean I need a new oxygen sensor on my Honda?

Often yes, since the heater element inside the sensor is a common failure point on higher-mileage Hondas, but it's worth checking the wiring harness near the exhaust manifold first since heat damage there mimics a sensor failure.

Can I still drive with a P0135 code on my Honda?

Short term yes, since it mainly affects how quickly the O2 sensor reaches operating temperature, but fuel economy and emissions performance can suffer, and it may eventually trigger a check engine light pattern that masks other issues.

Why does this code come back after I replace the O2 sensor?

If the new sensor isn't fixing it, the wiring harness insulation near the exhaust manifold is a common culprit on Honda engines and should be inspected for heat-related cracking or corrosion at the connector.