P0174 on a 2017 Toyota Camry
Fuel System Too Lean (Bank 2)
P0174 on a 2017 Toyota Camry indicates fuel system too lean (bank 2). It usually stays drivable short-term but should be diagnosed promptly. The most common cause is vacuum leak specific to bank 2 (intake gasket, vacuum tee, brake-booster tee) (typically $80–$600). Confirm the root cause before replacing parts.
What does P0174 mean on a 2017 Toyota Camry?
P0174 is the Bank 2 counterpart of P0171. It is set when the engine control module sees long-term fuel trim on Bank 2 driven beyond approximately +25 %. The ECM is adding the maximum allowed amount of fuel and the Bank 2 oxygen sensor still reports lean. Because P0174 only applies to V-engines and engines with separate exhaust banks, whether P0174 appears alongside P0171 tells you a lot about the root cause.
This guide covers P0174 across the 2015-2019 Toyota Camry generation — the symptoms, causes, and diagnostic steps below apply to every model year from 2015 through 2019.
Is it safe to drive a 2017 Toyota Camry with P0174?
In most cases a 2017 Toyota Camry stays drivable for short trips with P0174 active, but diagnose and repair it promptly. This is a moderate-severity code — ignoring it can lead to further damage or a failed emissions test.
What are the symptoms of P0174 on a 2017 Toyota Camry?
- Check Engine Light is illuminated
- Rough idle, especially when cold
- Hesitation or stumble on light acceleration
- Reduced fuel economy
- Mild power loss
- Possible whistling vacuum-leak sound
What causes P0174 on a 2017 Toyota Camry?
| Cause | Likelihood | Estimated repair (USD) |
|---|---|---|
| Vacuum leak specific to Bank 2 (intake gasket, vacuum tee, brake-booster tee) | Most common | $80–$600 |
| Cracked plastic intake manifold on V-engines (common on Ford and Chrysler V6/V8s) | Common | $250–$900 |
| Bank 2 fuel injectors clogged or under-delivering | Common | $150–$1,200 |
| Bank 2 upstream O2 sensor lazy or biased lean | Common | $150–$450 |
| Bank 2 exhaust leak upstream of the front O2 sensor | Occasional | $100–$500 |
| Weak fuel pump or clogged filter (both banks lean — P0171 also present) | Occasional | $80–$900 |
| PCV system fault drawing extra air into Bank 2 | Occasional | $30–$200 |
How to diagnose this on a 2017 Toyota Camry
-
Determine whether P0171 is also present
Pull all codes. If P0174 sets alone, the cause is on Bank 2 specifically — an intake leak on that side, injectors on that side, or the Bank 2 O2 sensor. If P0171 and P0174 set together, the cause is something affecting the whole engine: low fuel pressure, MAF issue, large vacuum leak.
Tools: Scan tool
-
Identify the Bank 2 side of the engine
On most transverse V6s Bank 2 is the bank closest to the radiator. On Ford modular V8s Bank 2 is the passenger side. On GM truck V8s Bank 2 is the passenger side. Confirm in the service manual before pulling parts.
Tools: Vehicle-specific service information
-
Smoke-test the Bank 2 intake side
With smoke in the intake, focus on the Bank 2 intake runner gaskets, the vacuum lines that feed Bank 2 specifically, and the brake booster line if it tees into Bank 2. Cracked plastic intake manifolds on Ford 4.6 V8s, Chrysler 4.0 inline-6, and several GM engines are classic Bank-2-specific P0174 causes.
Tools: EVAP / intake smoke machine, Flashlight and mirror
-
Compare Bank 1 vs Bank 2 fuel trims
With the engine warm, read Bank 1 LTFT and Bank 2 LTFT simultaneously. A 10 %+ difference between banks isolates the problem to the bank with the higher positive number.
Tools: Scan tool with multi-PID display
-
Test Bank 2 injectors for low flow
Run the scan tool injector balance test on Bank 2 injectors only. An injector that does not produce as much pressure drop as its peers is under-delivering fuel and causing the bank-specific lean condition.
Tools: Scan tool with injector balance
Known Technical Service Bulletins for the 2015-2019 Toyota Camry
Manufacturers publish Technical Service Bulletins (TSBs) when a known issue affects a specific vehicle. These bulletins come from the NHTSA database for your Toyota Camry.
- ENGINE Feb 13, 2026
This bulletin includes basic procedures for performing a rescue charge on Ni-MH high voltage (HV) batteries. This bulletin should be used in conjunction with the applicable model and model year Repair Manual while performing a rescue charge. The GRX-5100 should be used wherever the Repair Manual references the Toyota Hybrid System (THS) charger.
NHTSA #11029893 - ENGINE Feb 13, 2026
OBSOLETE NOTICE February 13, 2026: This bulletin is now obsolete. Please see T-SB-0009-26.
NHTSA #11029892 - UNKNOWN OR OTHER Jan 7, 2026
Some 2005 – 2026 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a musty odor is present. Follow the procedures in this bulletin to remediate the odor and address this condition. The purpose of this Service Bulletin is to provide general guidelines and procedures for odor remediation. This Service Bulletin provides a guide on how to prepare and treat the interior of the vehicle for odor remediation. Refer to the applicable model and model year Repair Manual and the EPA (Environmental Protection Agency) website for the most up-to-date safety and precautionary guidelines.
NHTSA #11028712 - ELECTRICAL SYSTEM Jun 13, 2025
The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service Bulletin aid in locating, inspecting, and repairing refrigerant leaks.
NHTSA #11020657 - STRUCTURE Dec 6, 2024
To prevent brake rotor rust from forming during transportation and storage, wheel film will be used instead of a cardboard type of anti-rust cover. The purpose of the wheel film is to shield the disc brake rotor from weather elements and initial rust before the vehicle is delivered to the customer. Consequently, the film should remain on the wheel for as long as possible.
NHTSA #11012743 - STRUCTURE Dec 6, 2024
The condition known as acid rain is caused by airborne chemicals or particles in the atmosphere, which mix with rainwater, nighttime dew, or high humidity to form acidic compounds. If these contaminants settle and remain on a painted vehicle surface, especially the horizonal areas of the hood, roof, and decklid, significant damage can occur. This damage is the result of actual etching of the paint and appears as pitting or water spots. As acid rain droplets on the vehicle surface evaporate, the concentration strength of the acid increases, causing deeper and more rapid damage. This evaporation and corrosive action also occur more rapidly on dark colored cars as direct sun heat increases. It is the dealer’s responsibility to protect and maintain the quality of the vehicle’s paint finish after receipt at the dealership prior to the first sale. In areas known for high frequency and/or concentration of acid rain, frequent vehicle washing during high heat or humidity periods will minimize the potential for paint damage caused by acid rain. It is further recommended that either reverse osmosis or deionized water be used to prevent water spotting.
NHTSA #11012744
+14 more TSBs available in MECH AI's TSB explorer for this vehicle.
NHTSA complaints & recalls for the 2017 Toyota Camry
Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2017 Toyota Camry. Use these to gauge how common a problem is on your specific vehicle before you start chasing Toyota Camry diagnostics.
- VEHICLE SPEED CONTROL 19
- UNKNOWN OR OTHER 31
- AIR BAGS 24
- ELECTRICAL SYSTEM 22
- SERVICE BRAKES 21
3 active recalls
- EQUIPMENT:OTHER:LABELS Jun 2019
Southeast Toyota Distributors, LLC (SET) is recalling certain 2017-2019 Toyota Camry, Corolla, Rav4, Sienna, and Yaris iA vehicles equipped with factory-installed floor mats. The load carrying capacity modification label may be incorrect. As such, these vehicles fail to comply…
NHTSA campaign 19V503000 - AIR BAGS:KNEE BOLSTER Dec 2016
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain model year 2016 Avalon, and 2017 Camry vehicles manufactured August 3, 2016, to September 12, 2016. The front passenger knee air bag module may have been attached to the lower instrument panel with incorrect…
NHTSA campaign 16V906000 - TIRES:TEMPORARY/EMERGENCY SPARE TIRE May 2017
Gulf States Toyota, Inc. (Gulf States) is recalling certain 2017 4Runner , 86, Avalon, Camry, Camry Hybrid, Corolla, Corolla iM, Highlander, Highlander Hybrid, Prius, Prius C, RAV4, RAV4 Hybrid, Sienna and Yaris vehicles. The spare tire air pressure was not adjusted to the prop…
NHTSA campaign 17V295000
How do I fix P0174 on a 2017 Toyota Camry?
- Repair Bank 2 vacuum / intake leaks
- Replace cracked plastic intake manifold (model-specific)
- Clean or replace Bank 2 fuel injectors
- Replace the Bank 2 upstream O2 sensor
- Repair Bank 2 exhaust leaks
About the 2015-2019 Toyota Camry
The 2015-2019 Toyota Camry was commonly sold with the following powertrains: 2.5L I4, 3.5L V6, 2.5L Hybrid I4. Common trims include LE, SE, XLE, XSE.
P0171 + P0174 together vs. P0174 alone
The presence pattern is your best diagnostic clue:
- Both P0171 and P0174 active → systemic problem affecting both banks. Check the MAF, fuel pressure, large vacuum leaks (brake booster, PCV hose, throttle body gasket), and the common air intake.
- Only P0174 active → Bank-2-specific problem. Inspect Bank 2 intake gaskets, Bank 2 injectors, Bank 2 O2 sensor, and Bank 2 exhaust upstream of the front sensor.
Why cracked intake manifolds are so common
Plastic intake manifolds began appearing in the mid-1990s for weight and heat-soak benefits. Two decades of thermal cycling has caused many of them to crack — particularly Ford 4.6 V8 (cracked coolant passage near the EGR tube), Chrysler 4.0 inline-6 (rear of the manifold), and GM 3.6 V6. The crack is often invisible to the eye and only shows up under smoke pressure.
Driving with P0174 long-term
Like P0171, mild long-term lean operation does not destroy the engine quickly, but sustained lean conditions raise combustion temperatures. The risks build over months: pinged spark plug electrodes, eventual catalyst damage, and burnt exhaust valves on the affected bank. Fix P0174 within a few weeks rather than letting it ride for a year.
P0174 on a 2017 Toyota Camry: frequently asked questions
What does diagnostic trouble code P0174 mean on a 2017 Toyota Camry?
P0174 is the Bank 2 counterpart of P0171. It is set when the engine control module sees long-term fuel trim on Bank 2 driven beyond approximately +25 %. The ECM is adding the maximum allowed amount of fuel and the Bank 2 oxygen sensor still reports lean. Because P0174 only applies to V-engines and engines with separate exhaust banks, whether P0174 appears alongside P0171 tells you a lot about the root cause.
What are the symptoms of P0174 on a 2017 Toyota Camry?
Check Engine Light is illuminated. Rough idle, especially when cold. Hesitation or stumble on light acceleration. Reduced fuel economy. Mild power loss. Possible whistling vacuum-leak sound
What causes P0174 on a 2017 Toyota Camry?
Vacuum leak specific to Bank 2 (intake gasket, vacuum tee, brake-booster tee) (most-common). Cracked plastic intake manifold on V-engines (common on Ford and Chrysler V6/V8s) (common). Bank 2 fuel injectors clogged or under-delivering (common). Bank 2 upstream O2 sensor lazy or biased lean (common). Bank 2 exhaust leak upstream of the front O2 sensor (occasional). Weak fuel pump or clogged filter (both banks lean — P0171 also present) (occasional). PCV system fault drawing extra air into Bank 2 (occasional)
Is it safe to drive a 2017 Toyota Camry with P0174?
In most cases a 2017 Toyota Camry stays drivable for short trips with P0174 active, but it should be diagnosed and repaired promptly — this is a moderate-severity code. Ignoring it can lead to further damage or a failed emissions test.