P0179 OBD-II Trouble Code: Fuel Composition Sensor Circuit High Input

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0179 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0179 code

P0179 is a diagnostic trouble code (DTC) for "Fuel Composition Sensor Circuit High Input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0179 DIAGNOSTIC Get a fair and transparent estimate upfront

P0179 code definition

Fuel Composition Sensor Circuit High Input

What the P0179 code means

P0179 is a generic OBD-II code that is triggered by high input from the diesel fuel sensor, typically indicating a shorted circuit in the sensor. or wiring to the sensor

What causes the P0179 code?

  • The engine control module (ECM) detects excessive sensor circuit input on the high end of the specifications

  • The ECM detects high circuit input if the wiring or connection to the sensor is shorted, which could be the result of fuel contamination of the connection or sensor, or melted wiring shorting the sensor wires together

What are the symptoms of the P0179 code?

  • The Water in Fuel Light illuminates on the instrument cluster

  • The ECM sets code P0179 to memory and triggers the Check Engine Light

  • Excessive water in the fuel could cause engine running problems if the sensor cannot detect it

How does a mechanic diagnose the P0179 code?

  • Scans codes and documents the freeze frame data, then clears the codes to verify code returns

  • Does a visual check of all the wiring and connections to the sensor to check for shorts in the wiring or connections

  • Disconnects the connection to the sensor and checks to see if the sensor connection is corroded or contaminated, which could cause a short

Common mistakes when diagnosing the P0179 code

Follow these simple guidelines to prevent misdiagnosis:

  • Do a visual check of connections to the sensor to make sure they are making good contact. The connection may be shorted from someone not securing it properly after servicing the filter, and the pins could be bent on the sensor or connector.

  • Disconnect the sensor connector and retest the system; if code P0179 is gone and replaced with code P0178 or P0177, that’s an indication that the wiring is not shorted.

How serious is the P0179 code?

  • You will have engine starting and running issues if excessive water is in the fuel and the sensor cannot detect it

  • The engine may misfire, hesitate and stall if excessive water is in the fuel

  • If there is no problems with the fuel then the only issue will be the check engine and water in fuel light will be on.

What repairs can fix the P0179 code?

  • Draining off the water in the fuel filter and clearing Check Engine Light codes
  • Replacing the shorted defective sensor
  • Repairing the short circuit or burned wiring or connection to the sensor
  • Replacing the fuel filter housing with the sensor and clearing the codes

Additional comments for consideration regarding the P0179 code

Not many manufactures use code P0179; it’s only an indicator of water in the fuel and may be damaged by fuel additives. The code can be triggered by wiring shorts, or connector shorts.

Need help with a P0179 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

trouble codes
P0179
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0179 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,810

Rating Summary
4,424
187
47
28
124
4,424
187
47
28
124

Joel

19 years of experience
741 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

Christopher

15 years of experience
41 reviews
Christopher
15 years of experience
Honda Accord - Check Engine Light is on - Fairburn, Georgia
Christopher was excellent! He explained everything in detail to make sure I understood. He was professional and provided me with the next course of actions to resolve my care issues. I'm glad he was sent to service my car.

Alexander

18 years of experience
58 reviews
Alexander
18 years of experience
Saab 9-7x - Check Engine Light is on - Kissimmee, Florida
He was very friendly and very helpful . I felt like it was being around a close friend , also gave me so very good advice on my car & future advice about it . Highly recommend mechanic, would use his services again .

Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Jeep Patriot - Check Engine Light is on - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

More related articles

P0420 OBD-II Trouble Code: Catalyst System Efficiency Below Threshold (Bank 1)
P0420 code means that either the upstream or downstream oxygen sensor in the catalytic converter is not working. Replacing these parts can fix P0420.
P0035 OBD-II Trouble Code: Turbocharger or Supercharger Bypass Valve Control Circuit High
P0035 P0035 trouble code definition P0035 is the code for Turbocharger or Supercharger Bypass Valve Control Circuit High What the P0035 code means It is necessary to understand that each manufacturer has a slightly different definition for this code as...
P0299 OBD-II Trouble Code: Turbo / Supercharger Underboost Condition
P0299 code definition P0299 is a generic OBD-II diagnostic trouble code indicating an underboost condition. What the P0299 code means The...

Related questions

Code P02A9 Cylinder 4 Balance-Fuel Trim at Limit

The code definition specifically indicates the number four fuel injector is leaking. Fuel trims are used to indicate how much the PCM (powertrain control module) needs to adjust the fuel duty cycle to maintain the proper air fuel ratio. Duty...

Vacuum leak

Hi. This is a very common failure on vehicles like yours. So common, in fact, that there is a technical service bulletin (TSB) on it. The TSB is XT303-13 and it addressed the hissing sound from under the hood, as...

Check engine light has been on for a couple weeks starting blinking 2 days ago

When the check engine light is on, it means that the ECU has detected a malfunction and stored a trouble code to tell you what it is. When the check engine light is blinking, it means that the malfunction is...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com