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Engine-Codes – Lincoln – P1935 Lincoln

P1935 Lincoln Code - Fuel Additive Level Low

Quick Answer

The P1935 diagnostic trouble code for Lincoln vehicles indicates that the fuel additive level is low. Common causes include Low DEF fluid level, Malfunctioning DEF level sensor, DEF tank leak. 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 Lincoln indicates Fuel Additive Level Low.
Common causes
Common causes include Low DEF fluid level, Malfunctioning DEF level sensor, DEF tank leak.
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 17, 2024
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Code P1935 Lincoln Description

The P1935 diagnostic trouble code for Lincoln vehicles indicates that the fuel additive level is low. This code is typically associated with vehicles equipped with a diesel engine that requires the use of a diesel exhaust fluid (DEF) additive to meet emissions standards. The DEF is a solution that is injected into the exhaust stream to reduce harmful nitrogen oxide emissions. When the additive level is low, the vehicle's emissions may exceed legal limits, leading to decreased fuel efficiency and potential damage to the engine and emissions system.

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

Common Causes of P1935 Lincoln

  1. Low DEF fluid level
  2. Malfunctioning DEF level sensor
  3. DEF tank leak
  4. Clogged DEF injector
  5. Faulty wiring or connectors in the DEF system

Symptoms of P1935 Lincoln

  1. Illuminated check engine light
  2. Reduced engine power
  3. Increased exhaust emissions
  4. Poor fuel efficiency
  5. Engine misfires

How to Fix P1935 Lincoln

  1. Check the DEF fluid level and refill if low.
  2. Inspect the DEF tank, sensor, and injector for any leaks or malfunctions.
  3. Test the DEF level sensor for proper operation and replace if necessary.
  4. Clear the diagnostic trouble codes and reset the vehicle's computer.
  5. Perform a test drive to ensure the issue has been resolved and the check engine light does not reappear.

Cost to Fix P1935 Lincoln

The typical repair costs for addressing a P1935 code related to low fuel additive level in a Lincoln vehicle can range from $100 to $500, depending on the specific cause of the issue and the cost of replacement parts. This estimate includes the cost of diagnostic testing, parts, and labor. It is important to note that labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate based on your location and vehicle model.

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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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