P0175 OBD-II Trouble Code: P0175 System Too Rich (Bank 2)

Our certified mechanics come to you · Get a fair and transparent estimate upfront

EXCELLENT RATING ON

Cost of diagnosing the P0175 code

P0175 is a diagnostic trouble code (DTC) for "P0175 System Too Rich (Bank 2)". 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 for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 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 $154.99 $50.0
Toyota $154.99 $50.0
BMW $164.99 $50.0

*Estimates may vary by market

SCHEDULE P0175 DIAGNOSTIC Get a fair and transparent estimate upfront

P0175 code definition

P0175 System Too Rich (Bank 2)

What the P0175 code means

P0175 indicates that the Engine Control Module (ECM) detects too much fuel and not enough oxygen in the air fuel ratio (AFR). This code will set when the ECM can not compensate for the amount of air or fuel required to return the air fuel ratio back to the set parameters.

For gasoline powered engines, the most fuel efficient and cost efficient air fuel ratio is 14.7:1, or 14.7 parts air and 1 part fuel. This ratio also creates the maximum amount of power during the combustion process.

The combustion process is very simple yet fragile. In most vehicles, there are four to eight combustion chambers within the engine. Air, gasoline, and spark are all delivered to the combustion chambers to create an “explosion” (better known as combustion). The spark is delivered to each combustion chamber a nanosecond after the air and fuel reaches the chamber to ignite it. There is a piston in each combustion chamber; each piston is forced down by the combustion at a rapid rate, and at different times.

The difference in the timing of each piston is determined by the air fuel ratio and the timing of the engine. Once the piston is down, it must return to the up position in time for its next combustion process. The piston is forced back up little by little each time one of the other cylinders undergoes its own combustion process because they are all connected to a rotating assembly known as the crankshaft. It’s almost like a juggling effect; at any given time, one piston is on its way up, while another one is at its peak, and another piston is on its way down.

If something in this process goes out of sequence, internal engine components will work harder and work against each other, or the engine may even not run at all. In the case of code P0175, there will likely be higher gas consumption, as the ECM has detected that there is too much fuel being used.

What causes the P0175 code?

  • A clogged, stuck, or leaking fuel injector
  • Faulty fuel regulator
  • Dirty or faulty mass air flow sensor
  • Faulty coolant temperature sensor
  • Faulty thermostat
  • ECM needs reprogramming
  • Dirty or faulty oxygen sensor
  • Vacuum leak
  • Fuel delivery problem
  • Incorrect fuel pressure

What are the symptoms of the P0175 code?

  • Increased fuel consumption
  • Soot or black residue from exhaust
  • Check Engine Light illumination
  • Strong exhaust odors

How does a mechanic diagnose the P0175 code?

  • Checks the fuel pressure

  • Inspects the fuel injectors for restrictions

  • Checks fuel injector pulse

  • Examines the fuel lines for pinches or cracks

  • Inspects all vacuum lines for cracks and deterioration

  • Inspects the oxygen sensors

  • Uses a scan tool to read the engine temperature, then compares the findings to an infrared thermometer

Common mistakes when diagnosing the P0175 code?

  • Not checking the temperature of the engine with a scan tool and comparing it to a thermometer

  • Deeming a component bad without verifying through testing

How serious is the P0175 code?

  • A system that is running too rich will force the catalytic convertor to filter out more pollutants, which will shorten the lifespan of the catalytic convertor

  • The resulting increased gas consumption could be very expensive

  • Improper air fuel ratio causes the engine to work harder, which will shorten the lifespan of the engine

  • The engine will create increased levels of harmful pollutants

What repairs can fix the P0175 code?

Additional comments for consideration regarding the P0175 code

I strongly suggest verifying that the cooling system of the vehicle is working correctly. If the vehicle is running abnormally cool, the engine will always run in a rich condition. This is because the ECM is designed to run at a rich rate when cold to help warm the engine up faster. If the coolant temperature sensor is faulty or the thermostat is stuck open, the vehicle may never reach a warm temperature, which will cause it to always run in a rich condition.

Need help with a P0175 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 1-800-701-6230.

Check Engine Light
trouble codes
P0175

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0175 code.

SCHEDULE P0175 DIAGNOSTIC
Get a $50 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(8600)

Rating Summary
8017
273
65
46
199
8017
273
65
46
199
 at YourMechanic

Brandon

9 years of experience
133 reviews
Brandon
9 years of experience
Ford Escort L4-2.0L - Check Engine Light is on - Nashville, Tennessee
Brandon showed up ahead of schedule, was very personable and diagnosed my problems. He also scheduled my next appointments which will be with him.
 at YourMechanic

William

23 years of experience
33 reviews
William
23 years of experience
Lexus IS250 V6-2.5L - Check Engine Light is on - Mableton, Georgia
Arrived early which was great. William was courteous, and attentive to the issue. Even though it took several attempts I'm so happy he was determined to fix it and he did!
 at YourMechanic

Dan

40 years of experience
1080 reviews
Dan
40 years of experience
Plymouth Grand Voyager - Check Engine Light is on - Lawrenceville, Georgia
Mr. Dan Barber was quite patient, courteous and quite knowledgeable. From my observation, Mr. Barber appears to be quite professional.
 at YourMechanic

Christopher

9 years of experience
120 reviews
Christopher
9 years of experience
Ford Fiesta L4-1.6L - Check Engine Light is on - Smyrna, Georgia
Chris communicated with us each step of the way up until his arrival. He listened well, was knowledgeable, and was prepared. He took the time to diagnose the problem, explained the what, why and how and provided a solution. I would definitely recommend him and will use him again.


Related questions

2012 Mini Cooper Countryman O2 Sensors May have gone bad.
I would have to say do not replace the O2 sensors since they are just telling you the system is rich and they see it. You should have the Mass Airflow Sensor and any inlet tubes checked for leaks. Clean...
How I replace fuel filter
The fuel filter (https://www.yourmechanic.com/services/fuel-filter-replacement) for your car is in the fuel tank. If you want to replace it, you will need to replace the fuel pump (https://www.yourmechanic.com/services/fuel-pump-replacement). It isn't regularly serviceable item anymore. As for the codes, the P0172 (https://www.yourmechanic.com/article/p0172-obd-ii-trouble-code-system-too-rich-bank-1-by-blake-griffin)...
Codes P0129 and P0175.
Hello. Thank you for writing in. With the codes you are receiving, and due to the order in which they triggered, you will want to focus on the P0129 MAP sensor reading. The Manifold Absolute Pressure sensor uses a 5...

More related articles

P0291OBD-II Trouble Code: Cylinder 11 Injector Circuit Low
P0291 P0291 code definition When your vehicle’s PCM registers the P0291 code, it means that a voltage reading came from the fuel injector circuit – for cylinder number 11’s fuel injector – that doesn’t conform to the predetermined value referenced...
P2771 OBD-II Trouble Code: 4WD Low Switch Circuit
P2771 means the system detected a problem with four-wheel-drive low switch usually caused by bad sensors or solenoids or an electrical issue.
P3485 OBD-II Trouble Code: Cylinder 11 Exhaust Valve Control Malfunction
P3485 means an issue with cylinder 11’s exhaust valve control circuit which causes sluggish acceleration and decreased fuel economy.

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 (855) 347-2779 · hi@yourmechanic.com