P0175
Fix within a few daysThe engine computer detects too much fuel and not enough air in the exhaust on Bank 2.
Code P0175 means your engine is running too rich on Bank 2. Common causes: Leaky fuel injector (35%), faulty O2 sensor (25%), dirty MAF sensor (20%). Drivability: Limit driving, fix within a few days. Repair cost: $50-$200 DIY, $150-$500 professional.
Can I Drive With P0175?
Limit driving, fix within a few days
Essential trips under 10 miles, avoid highways and heavy acceleration. Prioritize immediate repair.
Stop driving immediately if: Flashing Check Engine Light, strong fuel smell, significant power loss, or black smoke from the exhaust
Symptoms of P0175
- 1Check Engine Light is on
- 2Rough idle or engine runs poorly
- 3Reduced fuel economy
- 4Black smoke from the exhaust
- 5Engine hesitation or lack of power
- 6Fuel smell from the exhaust
Common Causes of P0175
Parts most likely causing this code, ranked by probability
A leaky or stuck-open fuel injector on Bank 2 delivers too much fuel into the cylinder, causing a rich condition.
35% of P0175 cases are fixed by replacing a faulty fuel injector
A faulty O2 sensor on Bank 2 can send incorrect readings to the engine computer, causing it to add too much fuel.
25% of P0175 cases are fixed by replacing the upstream O2 sensor
A dirty or faulty MAF sensor can incorrectly measure the amount of air entering the engine, leading the computer to inject too much fuel.
20% of P0175 cases are fixed by cleaning or replacing the MAF sensor
A faulty fuel pressure regulator can cause excessively high fuel pressure, forcing too much fuel through the injectors.
10% of P0175 cases are fixed by replacing the fuel pressure regulator
If the ECT sensor incorrectly reports a cold engine, the computer will enrich the fuel mixture excessively.
5% of P0175 cases are fixed by replacing the ECT sensor
A purge valve stuck open can allow too many fuel vapors into the intake manifold, creating a rich condition.
5% of P0175 cases are fixed by replacing the EVAP purge valve
Check These First (Before Buying Parts)
- Visually inspect for any obvious vacuum leaks around the intake manifold or vacuum lines.
- Check the air filter for excessive dirt or obstruction.
- Ensure the gas cap is tight and not damaged (though less common for rich codes, it's a quick check).
How to Diagnose P0175
- 1Connect an OBD-II scan tool to check for other related codes and view freeze frame data.
- 2Monitor live data for Bank 2 short-term and long-term fuel trims. High negative numbers confirm a rich condition.
- 3Inspect the Bank 2 upstream O2 sensor readings. Look for readings consistently above 0.8V-0.9V.
- 4Check the MAF sensor readings. Compare to specifications or known good values for your engine.
- 5Perform a fuel pressure test at the fuel rail to ensure it's within manufacturer specifications.
- 6Inspect Bank 2 fuel injectors for leaks or spray pattern issues. Consider performing an injector balance test.
- 7Check the engine coolant temperature sensor readings on the scan tool to ensure they are accurate.
- 8Inspect the air filter for excessive dirt or obstruction.
P0175 on Popular Vehicles
Ford F-150
2004-2024Ford F-150s, particularly those with V8 engines, frequently experience P0175 due to a dirty or failing MAF sensor or a leaking fuel injector on Bank 2. Check for exhaust leaks near the O2 sensor as well.
55% fixed by MAF sensor cleaning/replacement or fuel injector replacement
Chevrolet Silverado
2007-2024For Chevrolet Silverado trucks with V8 engines, P0175 often points to a faulty upstream O2 sensor on Bank 2 or a failing fuel pressure regulator. MAF sensor issues are also common, so check its readings first.
50% fixed by O2 sensor or MAF sensor replacement
Toyota Camry
2007-2024On V6 Toyota Camry models, P0175 can be caused by a failing upstream O2 sensor on Bank 2 or a leaky fuel injector. Less commonly, a faulty EVAP purge valve can contribute to a rich condition.
45% fixed by O2 sensor or fuel injector replacement
Frequently Asked Questions
What does P0175 mean?
P0175 indicates that the engine's computer has detected an excessively rich fuel mixture on Bank 2 of the engine. This means there's too much fuel and not enough air in the exhaust gases.
Can I drive with P0175?
Limit driving, fix within a few days. Driving with a rich condition can cause significant damage to your catalytic converter over time due to unburned fuel reaching it. You will also experience poor fuel economy and reduced engine performance.
Will P0175 clear itself?
No, P0175 will not clear itself. The underlying mechanical or electrical issue causing the rich condition must be diagnosed and repaired. Once fixed, the code can be cleared with a scan tool, or it will clear after several drive cycles if the problem is resolved.
How do I fix P0175 myself?
Start by checking for vacuum leaks and inspecting your air filter. Use a scan tool to monitor fuel trims and O2 sensor readings on Bank 2. If fuel trims are very negative, consider testing fuel pressure, cleaning or replacing the MAF sensor, or inspecting/replacing the Bank 2 fuel injectors or upstream O2 sensor.
How much does it cost to fix P0175?
DIY repair costs range from $50 for a MAF sensor cleaner or a single fuel injector to $200 for an O2 sensor. Professional repair costs typically range from $150 to $500, depending on the specific part needing replacement and labor rates.
P0175 keeps coming back - why?
P0175 often returns if the root cause was misdiagnosed. Common reasons include not checking for all potential causes, replacing only one component when another is also faulty (e.g., a MAF sensor and a leaky injector), or overlooking a less common issue like a faulty EVAP purge valve or ECT sensor.
Will P0175 fail emissions/smog test?
Yes, P0175 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most states, and a rich condition directly impacts exhaust gas composition, leading to high hydrocarbon and carbon monoxide readings.
What's the difference between P0175 and P0172?
P0175 indicates a rich condition specifically on Bank 2 of the engine. P0172 indicates a rich condition on Bank 1. Bank 1 is the side of the engine with cylinder #1, and Bank 2 is the opposite side. If both codes are present, the issue affects both banks, pointing to a common component like the MAF sensor or fuel pressure regulator.
P0175 on Ford F-150
On Ford F-150s, especially with the 5.0L or 5.4L engines, P0175 is frequently caused by a faulty Mass Air Flow (MAF) sensor or a leaking fuel injector on Bank 2. It's important to check MAF sensor readings and fuel pressure before condemning injectors.
Questions to Ask Your Mechanic
Did you check the fuel trims for Bank 2 at idle and under load?
Good answer: Yes, Bank 2 short-term fuel trim is -25% and long-term is -18% at idle, confirming a rich condition. Under load, they remain highly negative.
What were the readings for the Bank 2 upstream O2 sensor?
Good answer: The Bank 2 upstream O2 sensor is consistently reading above 0.85 volts, indicating a rich mixture that the computer is trying to correct.
Have you performed a fuel pressure test and an injector balance test on Bank 2?
Good answer: Yes, fuel pressure is within spec, but the injector balance test showed injector #5 (on Bank 2) is flowing significantly more fuel than the others.
Repair Cost Estimate
DIY Repair
Parts only
$50-$200
Shop Repair
Parts + labor
$150-$500
Save $100-$300 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires a good understanding of engine systems and the use of an OBD-II scan tool for accurate diagnosis.
Cost of Waiting
Continued driving with a P0175 code sends excessive unburned fuel into your exhaust system. This unburned fuel overheats and damages your catalytic converter, turning a $50-$200 sensor or injector repair into a $800-$2,500 catalytic converter replacement.
While You're In There...
If you are replacing fuel injectors, it's a good time to replace the spark plugs on that bank as they may be fouled from the rich condition and are in the same general area.
While accessing spark plugs and injectors, inspecting or replacing ignition coils on Bank 2 can prevent future misfire issues, as they wear at a similar rate.
Tools You'll Need
- OBD-II Scan Tool
- Multimeter
- Fuel Pressure Gauge
- Basic Hand Tools (sockets, wrenches)
- O2 Sensor Socket (if replacing O2 sensor)
- Fuel Injector Puller (if replacing injectors)
P0175 is a common fuel system code. While it requires attention, most repairs are straightforward and will restore your engine's performance and fuel efficiency.
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Your Next Steps
Step 1: Connect an OBD-II scan tool to confirm P0175 and check for any other codes. Look at freeze frame data to understand engine conditions when the code set.
Step 2: Monitor live data for Bank 2 fuel trims and the upstream O2 sensor. If the O2 sensor voltage is consistently high (above 0.8V) and fuel trims are very negative, you have a confirmed rich condition.
Step 3: If O2 sensor and fuel trims confirm rich, test your fuel pressure and inspect the MAF sensor. If these are good, focus on Bank 2 fuel injectors. Parts you'll likely need: Bank 2 upstream O2 sensor, a set of Bank 2 fuel injectors, or a MAF sensor.