P0175 Code: Honda CR-V (2017-2023) - Causes, Symptoms & Fixes

No recalls found in NHTSA database

Based on the provided data for the Honda CR-V (2017–2023), there are no official recalls or complaint data shown for P0175. This guide uses general automotive knowledge to explain P0175 on this vehicle range and outlines practical steps, costs, and choices. Data limitations: there are no NHTSA complaint counts in the provided data, so the “statistics” section is not driven by complaint counts; the guide instead emphasizes common causes, symptoms, and standard diagnostic/workflow practices.

CODE MEANING AND SEVERITY

• Code meaning: P0175 = System Too Rich (Bank 2). In practice, this indicates the engine computer detected fuel delivery is richer than commanded for Bank 2, causing excess fuel in the combustion mixture.
• Vehicle context: The Honda CR-V (2017–2023) uses multiple engine configurations depending on market and trim (including 1.5L turbo and/or 2.4L naturally aspirated variants). On a 4-cylinder inline engine, there isn’t a second bank in the traditional sense, so P0175 is typically interpreted as a fuel-trim fault affecting the engine’s mixture. Some onboard diagnostics label it Bank 2 even on a 4-cylinder engine; treat P0175 as a rich condition for the affected bank and investigate the same root causes as you would for a generic “fuel trim rich” condition.
• Severity: Moderate. Prolonged running rich can degrade catalytic converter efficiency, foul spark plugs, reduce fuel economy, and may cause rough idle or misfires. It’s advisable to diagnose and repair promptly to avoid catalyst damage and other downstream issues.

COMMON CAUSES ON HONDA CR-V

• Vacuum leaks or cracked hoses (PCV line, intake manifold gaskets, vacuum fittings)
• Mass Air Flow (MAF) sensor contamination or failure (dirty readings cause incorrect air-fuel calculations)
• Intake air leaks or dirty/oxidized MAP sensor readings
• Faulty or leaking fuel injectors (stuck open or leaking)
• Fuel pressure regulator or fuel pump issues causing higher than expected fuel pressure
• Upstream O2 sensor (HO2S) fault or misreadings (sends incorrect trims to ECU)
• EVAP system issues (purge valve/straws canister leaks or valve sticking)
• Exhaust manifold leak or pre-cat leak affecting O2 sensor readings
• Dirty or contaminated fuel, or poor fuel quality
• Engine oil entering the intake (rare) or long oil-change intervals with degraded engine seals
• Engine management software or ECU adaptation issues (less common, but possible after certain repairs)
• Catalytic converter issues (blocked or degraded) can also trigger rich/lean misbehavior in some scenarios, though P0175 more commonly points to fuel-trim or air/fuel delivery faults

SYMPTOMS

• Check Engine Light (malfunction indicator lamp) active
• Rough idle or engine surge
• Reduced or irregular acceleration; noticeable loss of power
• Decreased fuel economy; louder engine at idle or during acceleration
• Possible strong fuel smell (gasoline) from exhaust or tailpipe
• Dark exhaust smoke in some cases (indicating rich mixture)
• Misfire codes (P0300–P0304) may appear if misfires accompany the rich condition
• O2 sensor readings showing consistently rich trim (LTFT/STFT) on the bank with the fault

DIAGNOSTIC STEPS

Note: Work through these steps systematically. Start with the simplest checks, then progress to more involved tests.

Step 1: Confirm and document

• Retrieve the code(s) and freeze-frame data. Note long-term fuel trim (LTFT) and short-term fuel trim (STFT) values for the affected bank.
• If there are multiple related codes (e.g., P0175 with P0171/P0174), record all.

Step 2: Inspect obvious sources of excess fuel or air restriction

• Visually inspect vacuum hoses and intake hoses for cracks, disconnections, or leaks; check PCV hose/valve.
• Inspect the intake air filter for clogging or debris.
• Check for oil or coolant leaks that could affect air/fuel delivery.

Step 3: Check the MAF and MAP sensors

• Inspect the MAF sensor for contamination (oil, dirt). If dirty, clean with appropriate MAF cleaner (follow manufacturer guidelines). If cleaning doesn’t resolve symptoms, test or replace.
• Check MAP sensor readings with scan tool data. A faulty MAP sensor can cause incorrect air-fuel calculations.

Step 4: Inspect fuel delivery and pressure

• If you have a fuel pressure gauge, test fuel pressure at idle and under load to ensure it remains within specification. A high fuel pressure or irregular pressure can cause a rich mixture.
• Check for fuel injector leaks (visually and via misfire or dyno data). A stuck-open injector can flood a cylinder or bank with fuel.
• Examine the fuel injectors’ electrical resistance and circuit for proper operation. Replace faulty injectors if necessary.

Step 5: Check oxygen sensors and exhaust

• Test upstream O2 sensor (before the catalytic converter) and downstream O2 sensor to see if readings align with engine operating conditions.
• Look for exhaust leaks near the manifold, at the oxygen sensors, or along the exhaust path that could alter sensor readings.
• If a sensor is failing, replace it and monitor fuel trims after replacement.

Step 6: Evaluate EVAP and related components

• Test the EVAP purge valve and lines for sticking or leaks. A stuck purge valve can alter vacuum and fuel trim readings.

Step 7: Rule out ignition and combustion factors

• Scan for misfire codes (P0300–P0304). Misfires can exacerbate fuel trim issues and complicate diagnosis.
• Check ignition coils and spark plugs for wear or fouling. Replace faulty plugs/coils as needed.

Step 8: Look for software or adaptation-related issues

• In some cases, a software update or ECU adaptation can influence fuel trim behavior. If all hardware checks out, consult a dealer/independent shop about possible software maintenance or updates.

Step 9: Consider catalytic converter condition

• If the catalyst is degraded or clogged, it can interact with sensor readings and fuel trims. If diagnosed as a catalyst issue, plan for replacement and assess after-treatment efficiency.

RELATED CODES

• P0171: System Too Lean (Bank 1)
• P0172: System Too Rich (Bank 1)
• P0174: System Too Lean (Bank 2)
• P0175: System Too Rich (Bank 2) (target code)
• P0300–P0304: Misfire codes (random/multiple/individual cylinder misfires)
• P0455: Evaporative emission system large leak
• P0420: Catalyst efficiency below threshold (sometimes appears when fuel trim issues affect cat performance)
  Note: For Honda CR-Vs, P0171/P0174 and P0175 often appear in conjunction with fuel trim faults or air intake issues. Thoroughly compare live data across banks and sensors.

REPAIR OPTIONS AND COSTS (2025 PRICES)

Prices vary by region, shop, and vehicle trim. The ranges below are approximate and reflect common CR-V repairs in 2025 dollars.

• MAF sensor cleaning or replacement

  • Cleaning: DIY cost (cleaner) or $0–$20 if you already have cleaner
  • Replacement: $120–$360 parts + $75–$150 labor

• Vacuum hose/PCV system repairs

  • Hoses, fittings, PCV valve: $20–$80 parts
  • Labor: $60–$150

• Upstream O2 sensor replacement (Bank 2 or relevant bank)

  • Parts: $60–$200
  • Labor: $60–$150

• MAP sensor or related air-sensor issues

  • Parts: $50–$150
  • Labor: $60–$140

• Fuel pressure regulator or fuel pump (if affected)

  • Regulator: $50–$150 parts; $60–$120 labor
  • Fuel pump: $250–$750 parts; $100–$200 labor

• Fuel injector service or replacement

  • Cleaning or service: $50–$150 per injector
  • Replacement: $120–$350 per injector (plus labor)

• EVAP purge valve and canister lines

  • Purge valve: $40–$120 parts; $60–$120 labor

• Exhaust leaks or manifold gaskets

  • Parts: $20–$150 (depending on gasket/pipe)
  • Labor: $100–$250

• Catalytic converter (last resort if cat is compromised)

  • Parts: $500–$1,800 (plus more for high-flow variants)
  • Labor: $200–$600
  • Note: Catalytic replacement is more expensive and typically a result of long-running rich conditions that damaged the cat.

• ECU/software update (dealer/authorized shop)

  • Cost: $0–$150 (depends on vehicle and coverage)

Important:

• The exact cause of P0175 may be one or a combination of the items above. Accurate diagnosis with live data is essential before ordering parts.

DIY vs PROFESSIONAL

• Do-it-yourself (DIY) friendly steps (usually feasible for beginners):
  • Inspect and replace obvious vacuum hoses, PCV valve, and air filter
  • Clean the MAF sensor carefully with proper cleaner; avoid touching sensing elements
  • Check for obvious exhaust leaks around the manifold and sensors
  • Basic OBD-II scanning and recording live data to compare trims
• Tasks typically better left to a professional:
  • Accurate fuel pressure testing and diagnosing fuel delivery issues
  • Replacing oxygen sensors, MAP sensors, or the MAF sensor if failure is suspected beyond cleaning
  • Verifying and diagnosing injector function (including electrical testing)
  • EVAP system diagnostics and leak testing (SMOG/EVAP testing or smoke test)
  • Catalytic converter assessment and replacement
  • ECU reprogramming or software updates (dealer tools)

If you’re new to car repair, start with safe, non-destructive diagnostics (air filter, hoses, MAF cleaning, scan data) and then move to professional help for fuel system or sensor replacement that requires special tools.

PREVENTION

• Regular maintenance: replace air filters on schedule; keep intake paths clean to prevent MAF contamination
• Use quality fuel and a reputable gas station; consider fuel system cleaners occasionally, but avoid overuse
• Inspect and replace cracked vacuum hoses promptly; ensure PCV valve is functioning
• Periodic EVAP system checks and proper sealing of gas cap
• Address engine misfires promptly to prevent catalyst damage and excessive fuel trimming
• Regularly inspect O2 sensors and replace them when out of spec
• If there are software/ECU updates for your model year, consider performing them through a dealer or certified shop

Summary

• P0175 on a 2017–2023 Honda CR-V indicates a rich condition on Bank 2. Start with a solid diagnostic approach focused on air intake, vacuum leaks, MAF/MAP sensors, and fuel delivery (pressure/injectors/O2 sensors). There are no recalls listed in the provided data; no recalls found in NHTSA database. Costs for repair vary widely by cause and region, with common repairs ranging from modest (hoses, sensors) to substantial (fuel system components, catalytic converter). Proceed with data-driven diagnostics, progressing from simple (visual inspection and scanner data) to complex (fuel system tests and possible component replacement). If in doubt, consult a qualified technician to confirm diagnosis and pricing.