P0135 Infiniti Code - HO2S11 Heater Circuit Fault
Quick Answer
Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0135 Infiniti indicates HO2S11 Heater Circuit Fault.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0135 Infiniti Description
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
What are the Possible Causes of the DTC P0135 Infiniti?
- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0135 Infiniti?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0135 Infiniti code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0135 Infiniti Code
What does the OBDII code P0135 mean for an Infiniti?
P0135 indicates a malfunction in the heater circuit of the upstream oxygen sensor (HO2S11) located before the catalytic converter on Bank 1.
What are the common symptoms of code P0135 on an Infiniti?
Symptoms may include a check engine light, poor fuel efficiency, rough idling, increased emissions, and difficulty passing a smog test.
What causes the P0135 code to appear on an Infiniti?
Common causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or an issue with the engine control module (ECM).
Can I drive my Infiniti with a P0135 code?
While the vehicle may still be drivable, ignoring the issue can result in reduced fuel efficiency, higher emissions, and potential damage to the catalytic converter.
How do I diagnose the P0135 code on an Infiniti?
Use an OBDII scanner to confirm the code, then inspect the oxygen sensor, wiring, and fuses for damage or faults. Test the heater circuit with a multimeter if necessary.
How much does it cost to fix the P0135 code on an Infiniti?
Replacing the oxygen sensor typically costs $150–$300, including parts and labor. Wiring repairs or ECM replacements can increase costs.
Can a bad oxygen sensor cause the P0135 code on an Infiniti?
Yes, a faulty upstream oxygen sensor is one of the most common causes of the P0135 code.
Do I need to replace both oxygen sensors if I have a P0135 code?
No, the P0135 code specifically refers to the upstream oxygen sensor on Bank 1. Replace only the faulty sensor unless others show signs of failure.
How can I prevent the P0135 code from reoccurring on my Infiniti?
Regular maintenance, including inspecting and replacing oxygen sensors as recommended by your vehicle's manufacturer, can help prevent this code.
What tools do I need to fix the P0135 code on an Infiniti?
You’ll need an OBDII scanner, a multimeter to test the circuit, and basic hand tools to replace the oxygen sensor if necessary.
Discuss the causes and fixes for P0135 Infiniti OBDII Code
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