P1170 – Mazda DTC

Mazda DTC P1170 – HO2S Bank 1 Sensor 1 Circuit Fixed (Bank 1 Sensor 1)

DTC P1170 meaning on Mazda

DTC P1170 refers to an issue with the HO2S (Heated Oxygen Sensor) Bank 1 Sensor 1 circuit on a Mazda vehicle. This diagnostic trouble code indicates that there is a fixed problem with the oxygen sensor located in bank 1, sensor 1 of the vehicle’s exhaust system.

Mazda DTC P1170 symptoms

Symptoms of DTC P1170 on a Mazda may include:

• Check Engine Light illuminated on the dashboard
• Decreased fuel efficiency
• Engine running rough or misfiring
• Reduced engine performance

Mazda DTC P1170 causes

Common causes of DTC P1170 on a Mazda include:

• Faulty HO2S (Heated Oxygen Sensor) Bank 1 Sensor 1
• Wiring or connector issues in the sensor circuit
• Exhaust system leaks
• Engine running rich or lean

Mazda DTC P1170 seriousness

DTC P1170 should not be ignored as it can lead to poor engine performance and decreased fuel efficiency. Ignoring this code may also cause damage to other components of the vehicle over time.

How to diagnose DTC P1170 on Mazda

To diagnose DTC P1170 on a Mazda, follow these steps:

1. Use an OBD-II scanner to retrieve the specific fault code.
2. Inspect the wiring and connectors related to HO2S Bank 1 Sensor 1 for any visible damage or corrosion.
3. Check the sensor’s voltage and resistance to determine if it is functioning correctly.
4. Perform a visual inspection of the exhaust system for leaks or damage.

How to fix DTC P1170 on Mazda

To fix DTC P1170 on a Mazda, you can:

1. Replace the HO2S Bank 1 Sensor 1 if it is faulty.
2. Repair any damaged wiring or connectors in the sensor circuit.
3. Address any exhaust system leaks or issues.
4. Clear the fault code and reset the Check Engine Light.

How to erase DTC P1170 on Mazda

To erase DTC P1170 on a Mazda:

1. Use an OBD-II scanner to clear the fault code from the vehicle’s computer.
2. Ensure that the underlying issue causing the fault code has been resolved.
3. Drive the vehicle to allow the system to retest and verify that the code does not return.

Recommended tools for Mazda diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.