📟
P0175 without P0172 means the problem is specific to Bank 2. When only Bank 2 runs rich, the MAF sensor (which affects all banks equally) is less likely to be the cause. Focus instead on Bank 2-specific components: injectors on Bank 2 cylinders, the Bank 2 O2 sensor, and the Bank 2 section of the intake manifold. See fuel injector cleaning service kits on Amazon ↗
🗺️ Where Is the Problem?
Engine system - P0175 indicates excessive fuel delivery specifically on Bank 2 of a multi-bank engine
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0175 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
🔎 Get the ranking for my exact car - $5.99 →
🎯 Top Causes & Probability
40%
#1 - Most Likely
MAF Sensor Affecting Bank 2 Fuel Trim
On V-engines, the MAF sensor serves both banks. A dirty MAF reading high airflow causes both banks to run rich. However, due to intake manifold design, Bank 2 may show a richer condition first or more severely. Clean the MAF before performing bank-specific diagnostics.
🔩 Part
$20–$180
👨🔧 Labor
$50–$100
⚡ DIY Difficulty
Easy
30%
#2 - Check First
Leaking Bank 2 Injectors
One or more fuel injectors serving Bank 2 cylinders may be delivering excess fuel due to dirty pintles or worn needle-seat seals. Testing all Bank 2 injectors together may reveal a pattern of over-delivery specific to that bank.
🔩 Part
$50–$200
👨🔧 Labor
$100–$250
⚡ DIY Difficulty
Medium
20%
#3 - Less Common
Bank 2 Fuel Pressure Issue
Some V-engines run separate fuel rails for each bank. A higher-than-specified pressure on the Bank 2 rail causes over-fueling specific to Bank 2. Verify by comparing Bank 1 and Bank 2 fuel trim values - significantly different trims indicate a bank-specific pressure issue.
🔩 Part
$25–$150
👨🔧 Labor
$50–$200
⚡ DIY Difficulty
Medium
10%
#4 -
Failed Bank 2 O2 Sensor Stuck Rich
If the B2S1 upstream sensor is stuck at high voltage, the ECM may adjust fuel trim in a way that worsens the condition on some control strategies. Verify B2S1 sensor switching behavior alongside P0175.
🔩 Part
$30–$150
👨🔧 Labor
$50–$120
⚡ DIY Difficulty
Easy
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Compare Bank 1 and Bank 2 Fuel Trims - Using a scan tool, display both B1 LTFT and B2 LTFT simultaneously. If Bank 2 is significantly more negative (e.g., B1 at -3%, B2 at -14%), the rich condition is bank-specific. If both banks show similar negative trims, a MAF sensor issue is more likely.
- Clean MAF Sensor and Recheck Trims - Regardless of bank symmetry, clean the MAF sensor first. After cleaning and 50 miles of driving, recheck B2 LTFT. If it returns to within 5% of zero, the MAF was over-reporting airflow. If B2 remains significantly negative, proceed with bank-specific injector and fuel pressure testing.
📍 Find a Trusted Shop Near You
Please enter a valid 5-digit ZIP code.
Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need