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P1935 Mazda Code - Fuel Additive Level Low

Quick Answer

The P1935 diagnostic trouble code for Mazda vehicles indicates that the fuel additive level is low. Common causes include Low fuel additive level in the tank, Faulty fuel additive level sensor, Clogged fuel lines. 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
P1935 Mazda indicates Fuel Additive Level Low.
Common causes
Common causes include Low fuel additive level in the tank, Faulty fuel additive level sensor, Clogged fuel lines.
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 08, 2024
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Code P1935 Mazda Description

The P1935 diagnostic trouble code for Mazda vehicles indicates that the fuel additive level is low. This code is typically associated with vehicles equipped with a diesel particulate filter (DPF) system. The DPF system is designed to reduce harmful emissions by trapping and burning off particulate matter in the exhaust. In order to function properly, the DPF system requires a certain level of fuel additive to aid in the regeneration process. When the fuel additive level is low, the DPF system may not be able to regenerate properly, leading to decreased performance and potential long-term damage to the engine and emissions system.

OBDII Code P1935 Mazda - Fuel Additive Level Low
P1935 Mazda Code - Fuel Additive Level Low

Common Causes of P1935 Mazda

  1. Low fuel additive level in the tank
  2. Faulty fuel additive level sensor
  3. Clogged fuel lines
  4. Malfunctioning DPF system
  5. Contaminated fuel additive

Symptoms of P1935 Mazda

  1. Check engine light illuminated
  2. Reduced engine power
  3. Increased fuel consumption
  4. Black smoke from exhaust
  5. Difficulty starting the engine

How to Fix P1935 Mazda

  1. Check fuel additive level: The first step in resolving this issue is to check the fuel additive level in the tank. If it is indeed low, adding the correct type and amount of fuel additive can help resolve the problem.
  2. Inspect fuel additive level sensor: If the fuel additive level is sufficient, the next step is to inspect the fuel additive level sensor for any faults or malfunctions. Replace the sensor if necessary.
  3. Check fuel lines: Clogged fuel lines can prevent the proper flow of fuel additive to the DPF system. Inspect the fuel lines and clear any obstructions.
  4. Test DPF system: Have the DPF system tested to ensure it is functioning correctly. Replace any faulty components as needed.
  5. Drain and refill fuel additive tank: If the fuel additive is found to be contaminated, drain the tank and refill it with fresh, clean fuel additive.

Cost to Fix P1935 Mazda

The cost of repairing a P1935 code related to low fuel additive level can vary depending on the specific cause of the issue. On average, the cost of parts for this repair could range from $50 to $200, while labor costs could range from $100 to $300. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and the specific repair shop. It is recommended to obtain quotes from local auto repair shops to get a more accurate cost 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.

Frequently Asked Questions about P1935 Mazda Code

1. What are the common symptoms of OBDII code P1935 in a Mazda related to low fuel additive level?

The common symptoms include the check engine light illuminating, decreased fuel efficiency, and potential issues with the vehicle's emissions system.

2. What causes the OBDII code P1935 in a Mazda indicating low fuel additive level?

The code is typically triggered when the vehicle's computer detects a low level of fuel additive, which is essential for proper emissions control and fuel system operation.

3. How can I diagnose the OBDII code P1935 in my Mazda related to low fuel additive level?

Diagnosing this code usually involves checking the fuel additive tank level sensor, inspecting the fuel additive tank for leaks or damage, and verifying the proper operation of the fuel additive system components.

4. Can I continue driving my Mazda with the OBDII code P1935 indicating low fuel additive level?

While the vehicle may still be operable with this code, it is recommended to address the issue promptly to prevent potential damage to the emissions system and ensure optimal engine performance.

5. How can I reset the OBDII code P1935 in my Mazda after addressing the low fuel additive level?

Once the issue causing the low fuel additive level is resolved, the code can typically be cleared using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

6. Is it safe to ignore the OBDII code P1935 related to low fuel additive level in my Mazda?

Ignoring this code can lead to increased emissions, decreased fuel efficiency, and potential long-term damage to the vehicle's emissions system, so it is not recommended to ignore it.

7. Are there any DIY repair tips for addressing the OBDII code P1935 indicating low fuel additive level in a Mazda?

DIY repair tips may include checking the fuel additive tank for visible issues, ensuring the tank is properly sealed, and verifying the electrical connections to the fuel additive system components.

8. How much does it typically cost to repair the OBDII code P1935 in a Mazda due to low fuel additive level?

The cost of repair can vary depending on the specific cause of the low fuel additive level, but it may involve replacing the fuel additive tank, sensor, or related components, with costs ranging from a few hundred to over a thousand dollars.

9. Can extreme weather conditions affect the OBDII code P1935 related to low fuel additive level in a Mazda?

Extreme temperature fluctuations or exposure to harsh environmental conditions can potentially impact the fuel additive system components, leading to issues with fuel additive levels and triggering the code.

10. How often should the fuel additive level be checked in a Mazda to prevent the OBDII code P1935 from appearing?

It is recommended to follow the manufacturer's maintenance schedule for inspecting and replenishing the fuel additive level to ensure proper operation of the emissions system and prevent the recurrence of the P1935 trouble code.

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