P0135 MINI Code - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1
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 MINI indicates O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1.
- 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 MINI 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 MINI?
- 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 MINI?
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 MINI 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 MINI Code
1. What are common symptoms of OBDII code P0135 in a MINI?
- Common symptoms include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light.
2. What does the O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1 code mean in a MINI?
- This code indicates that there is a malfunction in the heater circuit of the upstream oxygen sensor in the exhaust system.
3. What are the possible causes of OBDII code P0135 in a MINI?
- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a problem with the engine control module (ECM).
4. How can I diagnose the O2 sensor heater circuit malfunction in my MINI?
- Diagnosing this issue typically involves checking the oxygen sensor heater circuit for continuity, inspecting wiring for damage, and testing the sensor's resistance.
5. Can I still drive my MINI with OBDII code P0135?
- It is generally safe to drive your MINI with this code, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent further damage.
6. What are the repair options for fixing OBDII code P0135 in a MINI?
- Repair options include replacing the faulty oxygen sensor, repairing damaged wiring or connectors, checking and replacing fuses if needed, or addressing any ECM issues.
7. How much does it typically cost to repair OBDII code P0135 in a MINI?
- The cost of repairing this code can vary depending on the cause of the issue and labor rates, but it may range from $100 to $300 or more for parts and labor.
8. Can I reset the check engine light after repairing OBDII code P0135 in my MINI?
- Yes, the check engine light can be reset using an OBDII scanner or by disconnecting the car battery for a few minutes. However, it is important to ensure the issue is fully resolved before resetting the light.
9. What are the long-term effects of ignoring OBDII code P0135 in a MINI?
- Ignoring this code can lead to decreased fuel efficiency, increased emissions, and potential damage to the catalytic converter over time.
10. Is it possible for a DIY enthusiast to repair OBDII code P0135 in a MINI?
- Depending on your skill level and access to tools, DIY repair of this code is possible, especially if the issue is related to the oxygen sensor or wiring. However, professional diagnosis may be needed for more complex issues.
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