AutoCodes – Suzuki – P0174 Suzuki

P0174 Suzuki Code - Fuel Trim System Lean Bank 2

Quick Answer

The Engine Control Module (ECM) controls a Closed Loop air/fuel metering system to provide the best possible combination of drivability, fuel economy, and emission control. Common causes include Dirty or Restricted Air Filter, Dirty or Faulty Mass Air Flow (MAF) Sensor, Intake Air 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: P0174 Suzuki indicates Fuel Trim System Lean Bank 2.
Common causes: Common causes include Dirty or Restricted Air Filter, Dirty or Faulty Mass Air Flow (MAF) Sensor, Intake Air 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.

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Code Popularity 442

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 Nov 29, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0174 Suzuki Description

The Engine Control Module (ECM) controls a Closed Loop air/fuel metering system to provide the best possible combination of drivability, fuel economy, and emission control. The ECM monitors the Heated Oxygen Sensor (HO2S) signal voltage and adjusts the fuel delivery based on the signal voltage while in Closed Loop. A change made to the fuel delivery changes the long and short-term fuel trim values. The short-term fuel trim values change rapidly in response to the HO2S signal voltages. These changes fine-tune the engine fueling. The long-term fuel trim values change in response to trends in the short-term fuel trim. The long-term fuel trim makes coarse adjustments to fueling to re-center and restore control to short-term fuel trim. The ideal fuel trim values are around 0 %. A positive fuel trim value indicates that the ECM is adding fuel to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel to compensate for a rich condition. The Diagnostic Trouble Code (DTC) will be set when the average long-term fuel trim weighted average value is greater or less than a calibrated value.

OBDII Code P0174 Suzuki - Fuel Trim System Lean Bank 2 - AutoCodes.com — P0174 Suzuki Code - Fuel Trim System Lean Bank 2

What does this mean?

What are the Possible Causes of the DTC P0174 Suzuki?

Dirty or Restricted Air Filter
Dirty or Faulty Mass Air Flow (MAF) Sensor
Intake Air Leaks
Exhaust Gas Leaks
Fuel Contamination
Faulty or Clogged Fuel Injectors
Faulty Front Heated Oxygen Sensor
Ignition Misfiring
Low Fuel Pressure
Positive Crankcase Ventilation (PCV) Hose Leaks

How to Fix the DTC P0174 Suzuki?

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 P0174 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0174 is set in along with the P0171 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor. If the problem persists the MAF or Front Heated Oxygen (O2) Sensor will need to be replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0174 Suzuki 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 P0174 Suzuki Code

1. What does the OBDII code P0174 mean on a Suzuki?

P0174 indicates that the fuel trim system on Bank 2 is running too lean, meaning thereâ€™s too much air or not enough fuel in the air-fuel mixture.

2. What are the common symptoms of code P0174 in a Suzuki?

Symptoms include poor engine performance, rough idling, hesitation during acceleration, reduced fuel efficiency, and possibly an illuminated check engine light.

3. What causes a P0174 code on a Suzuki?

Common causes include a vacuum leak, faulty mass airflow (MAF) sensor, clogged fuel injectors, weak fuel pump, or leaking intake manifold gaskets.

4. Is it safe to drive a Suzuki with a P0174 code?

Driving with a P0174 code is possible but not recommended, as it may lead to poor performance, increased emissions, and potential engine damage if left unresolved.

5. How do I diagnose the P0174 code on my Suzuki?

Start by checking for vacuum leaks, inspecting the MAF sensor, testing the fuel pressure, and examining the intake manifold and gaskets for leaks or damage.

6. Can a dirty MAF sensor cause a P0174 code?

Yes, a dirty or faulty MAF sensor can send incorrect readings to the ECU, causing the air-fuel mixture to run lean and triggering the P0174 code.

7. How can I fix a P0174 code on my Suzuki?

Repairs may include cleaning or replacing the MAF sensor, fixing vacuum leaks, replacing faulty oxygen sensors, cleaning fuel injectors, or repairing intake manifold gaskets.

8. Can a clogged fuel injector cause a P0174 code?

Yes, a clogged fuel injector can restrict fuel delivery to Bank 2, resulting in a lean condition and triggering the P0174 code.

9. Will replacing the oxygen sensor fix a P0174 code?

Not always. While a faulty oxygen sensor can contribute to a lean condition, itâ€™s important to diagnose the root cause before replacing any parts.

10. How much does it cost to fix a P0174 code on a Suzuki?

The cost varies depending on the cause, ranging from $100 for cleaning a MAF sensor to $500 or more for fixing intake manifold leaks or replacing fuel system components.