AutoCodes – Infiniti – P0170 Infiniti

P0170 Infiniti Code - Fuel Trim Malfunction Bank 1

Quick Answer

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closer to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring. 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: P0170 Infiniti indicates Fuel Trim Malfunction Bank 1.
Common causes: Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring.
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.

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Code Popularity 9,163

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 21, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0170 Infiniti Description

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closer to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and lights up the Malfunction Indicator Light (MIL) (2 trip detection logic). The Diagnostic Trouble Code (DTC) will be set when the Fuel Injection System does not operate properly, or the amount of mixture ratio compensation is not correct.

OBDII Code P0170 Infiniti - Fuel Trim Malfunction Bank 1 - AutoCodes.com — P0170 Infiniti Code - Fuel Trim Malfunction Bank 1

What does this mean?

What are the Possible Causes of the DTC P0170 Infiniti?

Intake air leaks
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Lack of fuel
Faulty Mass Air Flow (MAF) sensor
Incorrect Positive Crankcase Ventilation (PCV) hose connection

How to Fix the DTC P0170 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.

What does this mean?

Code Tech Notes

A dirty air filter, air filter housing, Mass Air Flow (MAF) sensor, or faulty MAF sensor are common causes of the P0170 code.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0170 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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Need Help with the Code?

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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 P0170 Infiniti Code

1. What does the OBDII code P0170 mean on an Infiniti?

P0170 indicates a Fuel Trim Malfunction on Bank 1, meaning the engine control module (ECM) is unable to properly adjust the air-fuel mixture on the first cylinder bank.

2. What are the common symptoms of code P0170 on an Infiniti?

Symptoms may include poor fuel economy, rough idling, difficulty starting, reduced engine performance, and the illumination of the Check Engine Light.

3. What are the common causes of a P0170 code on an Infiniti?

Causes include a faulty mass airflow (MAF) sensor, vacuum leaks, a failing oxygen sensor, fuel injector issues, or a malfunctioning fuel pressure regulator.

4. Can a dirty air filter cause the P0170 code?

Yes, a clogged or dirty air filter can restrict airflow and disrupt the air-fuel mixture, potentially triggering the P0170 code.

5. How do I diagnose the P0170 code on my Infiniti?

Start by checking for vacuum leaks, inspecting the MAF sensor, testing the oxygen sensors, and verifying the fuel pressure is within specification.

6. Is it safe to drive with a P0170 code on my Infiniti?

Driving with a P0170 code is not recommended, as it can lead to poor performance, increased emissions, and potential engine damage if left unaddressed.

7. Can bad fuel cause the P0170 code?

Yes, using contaminated or low-quality fuel can disrupt fuel trim and trigger the P0170 code.

8. How do I fix the P0170 code on my Infiniti?

Repairs may involve cleaning or replacing the MAF sensor, fixing vacuum leaks, replacing the oxygen sensor, or addressing fuel system issues like faulty injectors.

9. Can a faulty MAF sensor alone cause the P0170 code?

Yes, a malfunctioning MAF sensor can give incorrect airflow readings to the ECM, leading to improper fuel trim adjustments and triggering the P0170 code.

10. How much does it typically cost to fix a P0170 code on an Infiniti?

Repair costs vary but can range from $100 to $400 depending on the underlying issue, such as replacing sensors or fixing vacuum leaks.