Error code P0175 - one of the most common problems in car fuel injection systems Nissan, indicating lean air/fuel mixture in bank 2 cylinders (if the engine is V-shaped) or in the second row of cylinders. Unlike P0171 (lean mixture in bank 1), this error most often appears on models with displacement engines - Qashqai J11, X-Trail T32, Pathfinder R52 and even Navara D40. It cannot be ignored: prolonged operation of the engine on a lean mixture leads to overheating, detonation and accelerated wear of the piston group.

In this article we will look not only reasons for P0175, but also the nuances of diagnostics - from checking sensors to analyzing the fuel system. We will pay special attention engine specifics MR20DD And QR25DE, where the error is often disguised as a malfunction of the catalyst or lambda probes. You will also find step-by-step repair instructions, cost of spare parts and answers to frequently asked questions from owners.

What does P0175 mean on Nissan?

Code P0175 stands for "System Too Lean (Bank 2)" — the system operates on a lean mixture in the second cylinder block. The electronic control unit (ECU) records an error when air to fuel ratio exceeds the norm (ideal value is 14.7:1). In practice, this means that there is too much air or not enough fuel entering the cylinders.

On Nissan with engines V6 (For example, Pathfinder or Murano) Bank 2 usually corresponds to the right bank of cylinders (when viewed in the direction of travel). On in-line engines (Qashqai, Juke) the error may indicate problems in the entire injection system, but is more often associated with faulty sensors or air leaks after throttle valve.

  • 🔧 Main symptoms P0175:
  • ⚠️ Floating speed at idle;
  • 🚗 Jerks during acceleration or loss of power;
  • ⛽ Increased fuel consumption (by 10–15%);
  • 🔥 Lamp lights up Check Engine.

It is important to understand that P0175 is not a death sentence, and a signal for diagnosis. In 60% of cases, the problem is solved by replacing consumables (air filter, fuel filter) or cleaning the throttle. However, in advanced cases, it may be necessary to repair fuel equipment or replace sensors.

Top 5 causes of error P0175 on Nissan

The reasons for mixture depletion are divided into two groups: lack of fuel And excess air. Below are the most common culprits of the error: P0175 taking into account the design features Nissan.

  1. Air leak after MAF sensor. On motors MR20DD And QR25DE The rubber pipes between the throttle and the intake manifold often crack. Also check the injector O-rings and vacuum hoses.
  2. Malfunction of the mass air flow (MAF) sensor. Dirty or damaged MAF transmits incorrect data to the ECU, which leads to incorrect calculation of fuel supply.
  3. Clogged fuel injectors. On cars with mileage over 100 thousand km, injectors are often clogged with deposits, which reduces their throughput.
  4. Malfunction of the fuel pump or pressure regulator. Low pressure in the rail (below 3.5 bar) is the direct cause of a lean mixture.
  5. Problems with lambda probes. Oxygen sensors (especially the second one, after the catalyst) can give false signals about a lean mixture, causing the ECU to adjust the fuel supply in the wrong direction.
📊 What engine is installed in your Nissan?
  • MR20DD (2.0 l)
  • QR25DE (2.5 l)
  • VQ35DE (3.5 l)
  • Other
  • I don't know

On Nissan X-Trail T31 And Qashqai J10 with motor MR20DE error P0175 often accompanied by code P0100 (MAF sensor circuit malfunction). This is due to a design feature - the sensor is located too close to the air filter and quickly becomes dirty.

⚠️ Attention: If error P0175 appears along with P0300 (misfire), check the spark plugs and ignition coils immediately. Prolonged operation in this mode can damage the catalyst.

Diagnosing error P0175: step-by-step instructions

To pinpoint the cause P0175, you will need a scanner (for example, Launch X431 or ELM327) and a multimeter. Below is a verification algorithm adapted for Nissan.

Clear faults and check if P0175 appears again|

Check fuel pressure (normal: 3.5–4.0 bar)|

Inspect the pipes for cracks or loose connections|

Test the MAF sensor (readings at idle: 2.5–3.5 g/s)|

Ring the lambda probe circuit (heater resistance: 2–10 Ohm) -->

1. Check for air leaks

The easiest way is smoke test or spraying potential leak points (pipes, manifold seals, vacuum hoses) with a soapy solution. On Nissan pay special attention to:

  • 🔹 Connecting the throttle valve to the intake manifold;
  • 🔹 The pipe from the crankcase ventilation valve (PCV);
  • 🔹 O-rings for fuel injectors.

2. Diagnostics of the MAF sensor

Remove the connector from MAF-sensor and start the engine. If operation stabilizes, the sensor is faulty. Also check its readings with a scanner:

Operating mode Normal readings (g/s) Symptom of malfunction
Idling 2.5–3.5 >5.0 or <1.0
2500 rpm 7.0–10.0 Sharp jumps in values
3000 rpm 12.0–15.0 Readings are stuck at one level

3. Checking the fuel system

Connect the pressure gauge to the fuel rail (on Nissan The fitting is usually located to the right of the manifold). The pressure should be:

  • 🔹 At idle: 3.5–4.0 bar;
  • 🔹 When releasing the gas: fall no lower 3.0 bar;
  • 🔹 When changing the throttle: rise to 5.0–5.5 bar.

If the pressure is below normal, check fuel pump (on Nissan it often fails after 150 thousand km) or pressure regulator (may “poison” fuel back into the tank).

💡

On motors VQ35DE (for example, in Nissan Teana J32) The fuel pressure regulator is built into the pump. If it malfunctions, the entire module must be replaced.

How to fix error P0175: from simple to complex

Repair methods depend on the identified cause. Let's start with the most accessible and cheapest solutions.

1. Cleaning the throttle valve and MAF sensor

On Nissan Qashqai J11 And X-Trail T32 The throttle valve is often contaminated with oil from the crankcase ventilation system. For cleaning:

  1. Remove the air duct pipe;
  2. Treat the damper with cleaner CARB CLEANER (do not use metal brushes!);
  3. Wipe contacts MAF-sensor with alcohol (lint-free cloth).

The cost of the cleaner is from 300 rubles. This procedure is recommended to be carried out every 30–40 thousand km.

2. Replacing air and fuel filters

A clogged air filter increases flow resistance, and a dirty fuel filter reduces system pressure. On Nissan filters are located:

  • 🔹 Air: in a plastic box next to the battery;
  • 🔹 Fuel: under the rear seat (on most models).

Price of original filters:

Detail Article Cost (RUB)
Air filter 16546-JD00A 800–1200
Fuel filter 16400-JD00A 1500–2500

3. Repair or replacement of fuel injectors

If the injectors are clogged, they can be washed at the stand (the cost of the service is 1500–3000 rubles). However, for runs over 200 thousand km, replacement is recommended. Original injectors for MR20DD cost ~5000 rub./piece, analogues (Denso, Bosch) - from 3000 rub.

To replace you will need:

  1. Remove the intake manifold;
  2. Disconnect the electrical connectors;
  3. Unscrew the injectors using a special puller (do not use pliers!).
⚠️ Attention: On Nissan Pathfinder R51 with motor VQ40DE When replacing injectors, be sure to update the O-rings. Old rings can cause air leaks and reoccurrence. P0175.

4. Replacing lambda probes

If the diagnostics showed a malfunction of the oxygen sensors, they will have to be replaced. On Nissan sensors are used NTK or Denso. Average cost:

  • 🔹 Upper (before catalyst): 4000–6000 rub.;
  • 🔹 Lower (after catalyst): 3000–5000 rub.

When replacing, follow the rules: never use thread sealant - this may damage the sensor. Tighten to a torque of 40–50 Nm.

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On engines VQ35DE (for example, in Nissan Murano Z51) when replacing lambda probes, it is necessary to reset the ECU adaptations via a diagnostic scanner. Without this error P0175 may stay.

Cost of repairs and selection of spare parts

Elimination price P0175 varies from 500 rubles (cleaning the throttle) to 30,000 rubles (replacing injectors + lambda probes). Below are approximate prices for popular models Nissan:

Type of repair Qashqai J11 (MR20DD) X-Trail T32 (QR25DE) Pathfinder R52 (VQ35DE)
Diagnostics (scanner + smoke test) 1500–2500 2000–3000 2500–3500
Cleaning MAF + throttle 1000–1500 1200–1800 1500–2000
Replacing the fuel pump 8000–12000 10000–14000 12000–18000
Replacing lambda probes (set) 7000–10000 8000–12000 10000–15000

When choosing spare parts, give preference to the original or proven analogues:

  • 🔹 Fuel pumps: Bosch (article 0580454035) or Aisin;
  • 🔹 Injectors: Denso (series 23250-...);
  • 🔹 Lambda probes: NTK (series 25060-...) or Denso (series DOX-0109).

On Nissan Almera N16 And Primera P12 with motors QR20DE Counterfeit sensors are common. Buy spare parts only from authorized dealers or trusted suppliers (for example, Exist.ru, Autodoc).

How to distinguish an original Denso injector from a fake

The original injectors have:

1. Denso logo engraved (not a sticker!);

2. Serial number on the case, matching the number on the packaging;

3. Clear pressure marking (for example, "3.5 BAR").

Fakes are usually lighter in weight and have rougher carvings.

Preventing error P0175 on Nissan

To avoid reappearance P0175, follow these simple guidelines:

  1. Change consumables regularly:
    • 🔹 Air filter - every 15-20 thousand km;
    • 🔹 Fuel filter - every 40-60 thousand km;
    • 🔹 Spark plugs - every 30–40 thousand km (for Nissan original - NGK or Denso).
  • Use quality fuel. On Nissan with direct injection (MR20DD) petrol recommended AI-95/98 with an octane rating of at least 95. Avoid gas stations with a dubious reputation.
  • Check the crankcase ventilation system. Clogged valve PCV leads to oil entering the intake tract and contamination MAF-sensor.
  • Diagnose the ECU. On Nissan after 100 thousand km, fuel system adaptations may fail. Resetting adaptations via scanner (ECU Reset) helps to avoid false errors.

    • On cars with mileage over 150 thousand km, it is recommended to carry out preventative cleaning of injectors on an ultrasound stand. This prevents clogging and ensures stable engine operation.

    Frequently asked questions about error code P0175 on Nissan

    Is it possible to drive with P0175?

    Short term - yes, but not recommended. Driving for a long time on a lean mixture leads to:

    • 🔥 Engine overheating and risk of damage to pistons;
    • 💥 Detonation, which destroys the connecting rod and piston group;
    • 🚜 Accelerated wear of the catalyst (at Nissan replacing the catalyst costs 30–50 thousand rubles).

    If the error appears for the first time, you can drive to the service station, but no more than 200–300 km.

    Why does P0175 appear after washing the engine?

    On Nissan error after washing P0175 often occurs due to:

    • 💦 Water getting into sensor connectors (especially MAF and lambda probes);
    • 🔌 Corrosion of contacts in wiring harnesses;
    • 🔥 Damage to the insulation of wires leading to the injectors.

    Solution: dry the engine with compressed air, treat the contacts WD-40 and reset the errors with the scanner.

    How to reset P0175 without a scan tool?

    On most Nissan reset Check Engine You can disconnect the battery:

    1. Remove the negative terminal for 10–15 minutes;
    2. Press the brake pedal (discharges the capacitors in the ECU);
    3. Reconnect the terminal and start the engine.

    ⚠️ Attention: This method will reset all ECU adaptations. After connecting the battery, the engine may operate unstably for the first 5–10 km (the system “learns” again).

    What other errors can accompany P0175?

    On Nissan P0175 often goes in conjunction with:

    • 🔹 P0171 - lean mixture in jar 1;
    • 🔹 P0100 or P0102 - malfunction MAF-sensor;
    • 🔹 P0300 — random misfires;
    • 🔹 P0420 - low catalyst efficiency (often a false error due to a lean mixture).

    If together with P0175 several errors are on, start diagnosing by checking MAF-sensor and tightness of the intake tract.

    Do I need to update the ECU firmware for error code P0175?

    On Nissan Qashqai J11 And X-Trail T32 with motors MR20DD Sometimes flashing the ECU helps (for example, to the version 64101-4M100 or newer). This is relevant if:

    • 🔹 The error appears after replacing the sensors;
    • 🔹 The engine is “stupid” at low speeds;
    • 🔹 The scanner shows inadequate fuel corrections (for example, +25% at idle).

    The cost of reflashing is 3000–5000 rubles. This should only be done from official dealers or trusted chip tuners.