P0175 Code: Dodge Charger (2021-2023) - Causes, Symptoms & Fixes

P0175 on a 2021-2023 Dodge Charger: Comprehensive diagnostic guide

Note on data limitations:

• No recalls found in NHTSA database for this make/model/year together.
• No official complaints data provided here beyond that. This guide uses general automotive knowledge for technical explanations and typical repair cost ranges you might expect in 2025. Always verify with your local shop and the vehicle’s service manual.

CODE MEANING AND SEVERITY

• Code meaning: P0175 = System Too Rich (Bank 2). This means the Engine Control Module (ECM) has detected that Bank 2 is operating with an excessively rich air-fuel mixture (more fuel than air) over a period of time.
• Bank 2 definition: On a Dodge Charger with a V6 or V8 engine, Bank 2 refers to one side of the engine’s intake/exhaust banks. For a V8 (e.g., Hemi), Bank 1 and Bank 2 correspond to the left and right banks of cylinders. Bank 2 Rich is a problem on the second bank.
• Severity: Moderate. Running rich can cause reduced fuel economy, fouled spark plugs, sooty exhaust, and potential catalyst damage if left unaddressed. The MIL (check engine light) can stay on, and long-term exposure can affect emissions readiness and catalyst health.

COMMON CAUSES ON DODGE CHARGER

• Vacuum/air intake issues on Bank 2:
  • Vacuum leaks in hoses, gaskets, or intake manifold near Bank 2.
  • Leaks in PCV or associated fittings on Bank 2 side.
• Fuel system and air measurement faults:
  • Faulty Bank 2 upstream oxygen sensor (Bank 2 Sensor 1) or Bank 2 downstream sensor (Bank 2 Sensor 2).
  • Dirty or failing Mass Air Flow (MAF) sensor or idle air control issues affecting Bank 2 readings.
  • Fuel pressure too high (over-fueling condition) due to faulty fuel pressure regulator or pump simply delivering excess pressure.
• Fuel delivery and injection:
  • Leaking or sticking fuel injector(s) on Bank 2.
  • Contaminated or incorrect fuel arriving to Bank 2 (bad fuel supply, ethanol issues, fuel pump issue).
• Fuel trims and management:
  • ECM compensating for a real leak or vacuum issue: high positive LTFT on Bank 2.
• Other possibilities:
  • Dirty intake, EGR (if applicable) problems, or ignition issues causing misinterpretation by sensors.
  • Wiring or connector problems to Bank 2 sensors (corrosion, loose connections).

SYMPTOMS

• Malfunction Indicator Light (MIL) or P0175 warning visible on scan tool.
• Noticeable decrease in fuel economy; engine running rich may cause black exhaust smoke or strong odor of unburnt fuel in some cases.
• Rough idle or hesitation, especially when warming up or at idle under load.
• Power loss or reduced acceleration, particularly under heavy throttle.
• Possible misfire indicators (P0302, P030X ranges) if misfires occur on Bank 2.
• Potential for fouled spark plugs in Bank 2 over time.
• Possible catalyst heat/lighting issues if the exhaust runs rich for an extended period.

DIAGNOSTIC STEPS

Preparation:

• Use a reliable OBD-II scan tool. Record freeze frame data and live data for Bank 2 (O2 sensors, Long-Term Fuel Trim (LTFT), Short-Term Fuel Trim (STFT), MAF readings, manifold pressures, etc.).
• Note whether the vehicle has 3.6L V6, 5.7L V8, or 6.4L Hemi variants; engine layout will affect Bank 2 sensor locations.

Step-by-step diagnostic flow:

Confirm and characterize with data

• Read P0175 and confirm which bank is Bank 2.
• Check LTFT for Bank 2; LTFT > +12% to +25% (or higher) over time strongly indicates a real rich condition. Also review STFT values for Bank 2.
• Compare Bank 2 upstream oxygen sensor (Bank 2 Sensor 1) voltage/ switching behavior to Bank 1 equivalents. If Bank 2 Sensor 1 is sluggish, stuck rich, or not fluctuating normally, consider sensor issues or upstream air/fuel measurement problems.

Inspect for obvious air leaks and vacuum issues on Bank 2

• Perform a visual inspection of hoses, vacuum lines, intake gaskets, and the PCV system on Bank 2.
• Use a smoke test if available to reveal sensitive vacuum leaks around Bank 2 components.
• Check for cracked intake boots or loose clamps near Bank 2.

Check sensors that affect air measurement

• MAF sensor: Inspect for dirt or contamination. A dirty MAF can cause incorrect airflow readings and a rich condition. Clean with a manufacturer-approved cleaner if allowed; replace if dirty beyond cleaning or if readings remain abnormal after cleaning.
• MAP sensor (if applicable on your engine): Ensure it’s reading correctly; inspect electrical connection.

Check Bank 2 O2 sensors

• Bank 2 upstream (Sensor 1): If it’s slow to respond or stuck rich, that can cause a real rich condition.
• Bank 2 downstream (Sensor 2): If it’s not switching as expected after the catalytic converter warms up, it can contribute to miscalculation of trim.
• Consider swapping Bank 2 sensors with known-good units temporarily to see if readings improve.

Inspect fuel delivery and pressure

• Use a fuel pressure gauge to compare Bank 2 fuel pressure with factory specification. If pressure is too high, diagnose regulator/fuel pump or possible injector leaks.
• If fuel pressure is low, check for pump restriction, clogged filter, or wiring to the pump.
• If possible, perform a fuel injector leak test on Bank 2 (listen for clicking and use “noid” tests or balance test if available).

Inspect Bank 2 fuel injectors

• Look for stuck-open or leaking injectors on Bank 2. A leaking injector can deliver excess fuel and cause a rich condition.
• If fuel injector cleaning or replacement is indicated, budget accordingly.

Check ignition and spark components

• Verify no misfires on Bank 2 (check ignition coils/cylinder-specific misfire data). Faulty ignition can confuse fuel trims and sensor readings.

Check engine mechanical/air path issues

• Intake manifold gasket leaks, especially on Bank 2, can richen the mixture. If suspected, perform a diagnostic smoke test.
• EGR system status (if equipped) and throttle body cleanliness can impact mixture readings.

Check for software/ECU concerns

• Ensure the vehicle has the latest service software/ECU calibration for your model year. Some updates adjust fuel trim behavior and sensor calibration.

Synthesize findings

• If multiple Bank 2 signals point to a single faulty component (e.g., Bank 2 Sensor 1 consistently rich and slow response, with clean MAF and correct fuel pressure), target that component for replacement.
• If no single faulty component is found but LTFT remains high on Bank 2, continue investigative work (vacuum leaks, wiring integrity, or uncommon fuel delivery issues) and consider a professional diagnostic flow.

RELATED CODES

• P0172: System Too Rich (Bank 1) — the other bank can also present a rich condition.
• P0171: System Too Lean (Bank 1) — sometimes seen with other fuel system issues affecting overall engine balance.
• P0174: System Too Lean (Bank 2) — a lean condition on Bank 2 (rare to see both P0174 and P0175 together, but possible with sensor faults or wiring issues).
• O2 sensor codes related to Bank 2: P0136, P0137, P0138, P0139, P0140, P0141 (depending on upstream/downstream and sensor health).
• MAF sensor codes: P0100, P0101, P0102, P0103, P0104.
• Other related driveability codes: P0300 (random/multiple misfire), P030X (cylinder-specific misfires).

REPAIR OPTIONS AND COSTS (2025 prices)

Prices are rough estimates for common repair scenarios in the US. Actual costs vary by location, vehicle condition, and shop. Labor rates often range from $90–$160 per hour.

• Clean/replace MAF sensor

  • Parts: $80–$250
  • Labor: $50–$150
  • Total: $130–$400
  • DIY note: Optional cleaning with approved cleaner if the sensor is not visibly damaged.

• Replace Bank 2 upstream O2 sensor (Bank 2 Sensor 1)

  • Parts: $120–$320
  • Labor: $60–$140
  • Total: $180–$460

• Replace Bank 2 downstream O2 sensor (Bank 2 Sensor 2)

  • Parts: $120–$320
  • Labor: $60–$150
  • Total: $180–$470

• Inspect/repair vacuum leaks (vacuum hoses, PCV, gaskets on Bank 2)

  • Parts: $10–$100
  • Labor: $50–$150
  • Total: $60–$250

• Fuel pressure regulator/fuel pump related (if over-fueling or high pressure)

  • Fuel pressure regulator: Parts $40–$150; Labor $60–$180 → Total $100–$330
  • Fuel pump (if failing): Parts $150–$600; Labor $200–$600 → Total $350–$1,200

• Fuel injector repair or replacement (Bank 2 injectors)

  • Cleaning service: $20–$60 per injector (DIY may be cheaper if you have tools)
  • Replacements: $120–$250 per injector (parts); Labor $80–$180 per injector
  • For one Bank 2 injector swap (usually 6–8 injectors total across engine): expect many shops charge $550–$1500 if multiple injectors are replaced.

• Throttle body cleaning or replacement

  • Cleaning: $60–$150 (DIY possible)
  • Replacement: Parts $200–$450; Labor $120–$240 → Total $320–$690

• PCV valve and associated fittings

  • Parts: $10–$40
  • Labor: $40–$120
  • Total: $50–$160

• EGR valve cleaning or replacement (if applicable)

  • Cleaning: $50–$120
  • Replacement: $150–$500 parts; $70–$200 labor
  • Total: $230–$700

• Spark plugs and ignition coils (if misfire contributes)

  • Spark plugs: $6–$25 each; for a V8 you may need 16 plugs
  • Coils (if required): $30–$120 each; total depends on number of coils affected
  • Labor: $100–$300 (depending on accessibility and cylinder count)
  • Total: potentially $300–$1200+ for a full set

• ECU software update (dealer/programmer)

  • Typically $0–$150 if covered by warranty or included with a service; otherwise $100–$250

Notes:

• If there is substantial catalyst damage due to prolonged rich operation, the cost to replace catalytic converters can be very high (several hundred to over a thousand dollars per converter). This is a worst-case outcome if the condition persists uncorrected.

DIY VS PROFESSIONAL

• DIY-friendly tasks (with proper tools and safety):

  • Inspect/clean MAF sensor
  • Inspect vacuum lines and PCV system
  • Check for obvious air intake leaks, replace cracked hoses
  • Basic O2 sensor replacement (if you’re comfortable with wiring and sensors)
  • Basic fuel pressure checks if you have a gauge and can access the fuel rail test port
  • Spark plug replacement or basic ignition coil inspection (if you’re mechanically inclined)

• Tasks generally better left to professionals:

  • Accurate fuel pressure testing and diagnosing fuel delivery issues
  • Bank 2 injector testing/cleaning or replacement
  • O2 sensor diagnostics that require precise live data interpretation or sensor swapping
  • Smoke testing to locate vacuum leaks
  • EGR-related diagnosis (if applicable) and catalytic converter concerns
  • Complex PCM tuning or updates

• Safety notes for DIY:

  • Always relieve fuel system pressure before disconnecting lines.
  • Work on a cool engine; disconnect the battery when dealing with electrical sensors.
  • Use proper disconnect tools and torque specs.
  • If you’re not confident, seek a professional.

PREVENTION

• Regular maintenance:

  • Replace air filter at recommended intervals; a clean air intake helps air-fuel calculations.
  • Use quality gasoline (Top Tier gasoline as recommended by many manufacturers) and avoid low-quality blends that can leave deposits.
  • Replace PCV valves and vacuum hoses as per service schedule or if signs of wear appear.
  • Clean MAF sensor with approved cleaner if dirty (per manufacturer guidance) rather than aggressive scrubbing.

• Sensor care:

  • Periodically inspect O2 sensors for corrosion or wiring damage; replace as needed.
  • If you notice odd idle, rough running, or sudden fuel economy drop, check O2 sensors early.

• Software updates:

  • Keep the vehicle’s ECM/PCM software up to date with dealer updates when applicable; sometimes updates address fuel trim behavior.

• Fuel quality and additives:

  • Avoid contaminated fuel; if you suspect bad fuel, drain or clean the fuel system as recommended by a shop.

Summary

• P0175 on the Dodge Charger indicates Bank 2 is running rich. Common causes include vacuum leaks on Bank 2, faulty Bank 2 O2 sensors, dirty MAF/MAP readings, high fuel pressure or injector issues on Bank 2, and ignition-related problems increasing fuel trims. Use a systematic diagnostic approach with live data to identify the root cause, starting with sensor health and air/fuel measurement, then moving to fuel delivery and vacuum integrity. Repair cost ranges vary widely; a mix of DIY cleaning and selective sensor replacement is common, but more complex fuel system issues and multiple-bank problems often require professional service.