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P1145 Buick Code - HO2S Cross Counts Bank 1 Sensor 3

Quick Answer

The P1145 Buick code refers to an issue with the HO2S (Heated Oxygen Sensor) Cross Counts on Bank 1 Sensor 3. Common causes include Faulty oxygen sensor, Wiring issues or connections, Vacuum leaks. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1145 Buick indicates HO2S Cross Counts Bank 1 Sensor 3.
Common causes
Common causes include Faulty oxygen sensor, Wiring issues or connections, Vacuum leaks.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1145 Buick Description

The P1145 Buick code refers to an issue with the HO2S (Heated Oxygen Sensor) Cross Counts on Bank 1 Sensor 3. This code indicates a problem with the oxygen sensor located on the third cylinder bank of the engine. The HO2S monitors the oxygen levels in the exhaust gases and sends this information to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. When the ECM detects that the cross counts from the sensor on bank 1, sensor 3 are out of the expected range, it will trigger the P1145 code.

OBDII Code P1145 Buick - HO2S Cross Counts Bank 1 Sensor 3
P1145 Buick Code - HO2S Cross Counts Bank 1 Sensor 3

Common Causes of P1145 Buick

  1. Faulty oxygen sensor
  2. Wiring issues or connections
  3. Vacuum leaks
  4. Exhaust system leaks
  5. Engine misfires

Symptoms of P1145 Buick

  1. Decreased fuel efficiency
  2. Rough idle or stalling
  3. Engine misfires
  4. Check Engine Light illuminated
  5. Increased emissions

How to Fix P1145 Buick

  1. Diagnose the issue by using a scan tool to read the code and investigate the oxygen sensor on bank 1, sensor 3.
  2. Check the wiring and connections to the oxygen sensor for any damage or corrosion. Repair or replace as needed.
  3. Inspect the exhaust system for leaks and repair any leaks found.
  4. Test the oxygen sensor's functionality using a multimeter or oscilloscope. Replace the sensor if it is faulty.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1145 Buick

The cost of repairing the P1145 Buick code can vary depending on the specific cause of the issue. Generally, the cost of replacing an oxygen sensor can range from $150 to $400, including parts and labor. Additional costs may be incurred if wiring repairs or exhaust system repairs are needed. It's important to note that labor rates for automotive repairs can vary, so it's advisable to check with local auto repair shops for a more precise estimate.

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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.

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