AutoCodes – Pontiac – P0135 Pontiac

P0135 Pontiac Code - HO2S Heater Performance Bank 1 Sensor 1

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection. 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 Pontiac indicates HO2S Heater Performance Bank 1 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection.
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.

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Code Popularity 29,592

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0135 Pontiac Description

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach an operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, the ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Engine Control Module (ECM). The ECM uses Pulse Width Modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S 1 heater current is out of factory specifications.

OBDII Code P0135 Pontiac - HO2S Heater Performance Bank 1 Sensor 1 - AutoCodes.com — P0135 Pontiac Code - HO2S Heater Performance Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0135 Pontiac?

Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted
Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
Heated Oxygen Sensor Bank 1 Sensor 1 circuit fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0135 Pontiac?

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.

What does this mean?

Code Tech Notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0135 Pontiac 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0135 Pontiac Code

1. What does the OBDII code P0135 for a Pontiac indicate?

The code P0135 indicates an issue with the HO2S (Heated Oxygen Sensor) heater performance on Bank 1 Sensor 1 in a Pontiac vehicle.

2. What are common symptoms of a P0135 OBDII code in a Pontiac?

Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the illumination of the check engine light.

3. What are possible causes of a P0135 code in a Pontiac?

Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, a malfunctioning PCM (powertrain control module), or issues with the heater circuit.

4. How can I diagnose a P0135 code in my Pontiac?

Diagnosis involves checking the oxygen sensor's heater circuit for continuity, inspecting wiring and connectors for any damage, and testing the oxygen sensor's heater resistance.

5. How can I repair a P0135 code in my Pontiac?

Repair options include replacing the oxygen sensor, repairing or replacing damaged wiring or connectors, checking and replacing any blown fuses, and addressing any PCM issues.

6. Can a P0135 code cause damage to my Pontiac if left untreated?

While driving with a P0135 code may not cause immediate harm, ignoring the issue can lead to decreased fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.

7. Are there any preventive measures to avoid a P0135 code in my Pontiac?

Regularly maintaining your vehicle, including performing scheduled tune-ups and inspections, can help prevent issues that may trigger a P0135 code.

8. How long does it typically take to repair a P0135 code in a Pontiac?

The repair time can vary depending on the exact cause of the issue and the expertise of the technician, but most repairs related to a P0135 code can be completed within a few hours.

9. Can I drive my Pontiac with a P0135 code until I can get it repaired?

It is generally not recommended to drive your Pontiac with a P0135 code for an extended period as it can lead to decreased performance and potential long-term damage to the vehicle.

10. Is it possible to reset the check engine light after repairing a P0135 code in my Pontiac?

Yes, once the underlying issue causing the P0135 code has been addressed and repaired, the check engine light can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a short period.