Error P0037 on cars Nissan is one of the most common problems associated with the exhaust system and exhaust gas control. This code points to low signal level of the second lambda probe (oxygen sensor), located after the catalytic converter in the first row of cylinders (Bank 1 Sensor 2). Unlike errors like P0130 or P0136, which indicate a malfunction of the first sensor, P0037 is directly related to catalyst efficiency monitoring and can result in a 10-15% increase in fuel consumption.

Owners Nissan Qashqai, X-Trail, Teana and other models often encounter this error after 100-150 thousand kilometers, but the reasons can vary from simple contamination of the sensor to serious problems with the wiring or ECU. In this article we will look at:

  • 🔍 What exactly does code P0037 mean? and how it affects engine performance.
  • 🛠️ Step-by-step diagnostics - from checking the sensor to analyzing signals with a scanner.
  • 💰 Repair cost in service vs. self-removal.
  • ⚠️ What not to do when this error appears, so as not to make the problem worse.

What does P0037 mean on Nissan?

Code P0037 stands for "HO2S Heater Control Circuit Low (Bank 1 Sensor 2)" — low signal level in the heater circuit of the second oxygen sensor. Unlike the first lambda probe (which controls the fuel mixture), the second sensor is responsible for catalyst efficiency monitoring. Its heating element must quickly bring the sensor to operating temperature (~600°C) so that the ECU receives accurate data on the oxygen content in the exhaust.

When the sensor heater does not work correctly, the following problems occur:

  • 🔥 Slow sensor response — The ECU receives incorrect data, which leads to the mixture becoming richer or leaner.
  • ⚡ Increased fuel consumption — the engine goes into emergency mode, compensating for the error.
  • 🚗 Dips during acceleration - especially noticeable on Nissan with turbo engines (For example, Pathfinder or Navara).
  • 🌍 Increased exhaust toxicity - may lead to failure of the technical inspection.

It is important to understand that P0037 does not always mean a sensor failure. In 30% of cases the problem lies in:

  • 🔌 Broken or short circuited wiring heater.
  • 🔋 Fuse faults (For example, EF15 on Nissan Almera N16).
  • 🖥️ ECU malfunction (less common, but occurs after firmware).
📊 What Nissan do you have?
  • Qashqai
  • X-Trail
  • Teana
  • Pathfinder
  • Other

Causes of error P0037

To accurately determine the source of the problem, consider all possible causes, ranked by frequency of occurrence:

Reason Frequency (%) Signs
Sensor heater malfunction 45% The error appears after a cold start, disappears when warming up
Break or short circuit in the wiring 30% Periodic sensor disconnection, error P0036 or P0038 paired with P0037
Sensor contamination with soot/oil 15% The error is accompanied by P0420 (low catalyst efficiency)
ECU or firmware malfunction 7% Multiple sensor errors, unstable engine operation
Engine weight problems 3% The error appears when turning on powerful consumers (headlights, air conditioning)

On Nissan with HR16DE engines (For example, Juke or Note) error P0037 often occurs due to poor contact in the sensor connector. Owners X-Trail T31 They often encounter a problem after replacing the catalyst with a flame arrester - in this case, the sensor detects too high an oxygen content, and the ECU perceives this as a heater malfunction.

⚠️ Attention: If the error P0037 accompanied by code P0420 (low catalyst efficiency), first check the integrity of the catalytic converter. Replacing the sensor without eliminating the cause of contamination will lead to repeated failure.

How to diagnose error P0037 yourself?

For diagnosis you will need:

  • 🔧 Multimeter (to check heater resistance and supply voltage).
  • 📱 Diagnostic scanner (ELM327 or equivalent for reading parameters in real time).
  • 🔍 Visual inspection wiring and connectors.

Step 1. Checking the sensor with a multimeter

Disconnect the second lambda probe connector (Bank 1 Sensor 2) and measure the resistance of the heater between the contacts 3 And 4 (on most models Nissan these are white and black wires). Normal value:

  • 🔹 2–10 ohms at room temperature.
  • 🔹 More than 1 MOhm — heater breakage.
  • 🔹 Less than 1 ohm - short circuit.

Step 2. Checking the heater power

Turn on the ignition (without starting the engine) and measure the voltage between the contacts 3 (plus) and 2 (ground) of the sensor connector. Norm:

  • 🔋 12 V - nutrition is normal.
  • 🔋 0 V - open or faulty fuse (check EF15 in the block under the hood).

Check the resistance of the sensor heater|Measure the supply voltage at the connector|Inspect the wiring for damage|Read the sensor parameters with a scanner-->

Step 3. Parameter analysis by scanner

Connect the scanner and check the following parameters in real time:

  • 📊 Sensor voltage (Bank 1 Sensor 2) - must fluctuate within a range 0.1–0.9 V.
  • 📊 Sensor temperature - after warming up it should reach 600–800°C.
  • 📊 Short circuit to ground - if the parameter shows OL, the problem is in the wiring.

⚠️ Attention: On Nissan with EGR system (For example, Qashqai J10) error P0037 may appear due to air leaks through the EGR valve. Before replacing the sensor, check the intake system for leaks!

How to fix error P0037: step-by-step instructions

Depending on the cause, repairs may include the following steps:

1. Cleaning the sensor (if dirty)

If the sensor is covered with soot or oil (often on Nissan with mileage >150 thousand km), you can try to clear it:

  • 🧴 Remove the sensor and soak it in phosphoric acid for 20–30 minutes.
  • 🧽 Rinse with water and dry.
  • ⚠️ Do not use metal brushes - they will damage the protective layer!

2. Wiring repair

If an open or short circuit is detected:

  • 🔧 Strip and solder the damaged wires, insulating them with heat shrink tube.
  • 🔌 Check the contacts in the connector - often oxidation leads to signal loss.
  • 📍 On Nissan X-Trail T32 Pay special attention to the harness near the exhaust manifold - it often frays.

3. Replacing the oxygen sensor

If the heater is faulty, the sensor must be replaced. For Nissan original sensors fit:

  • 🔹 Nissan 22690-4M015 (for Qashqai J11, X-Trail T32).
  • 🔹 Nissan 22690-AL50A (for Teana J32, Altima).
  • 🔹 Analogues: Bosch 0 258 006 537, Denso 234-4207.

Cost of the original sensor: RUB 3,500–7,000, analogue: 1,500–3,000 rub.

💡

Before replacing the sensor, clear the errors with a scan tool and check to see if P0037 appears again. If yes, the problem is in the wiring or the ECU.

4. Checking the ECU and firmware

If after replacing the sensor and repairing the wiring the error remains:

  • 🖥️ Swipe ECU diagnostics for errors in power supply circuits.
  • 🔄 Update the firmware (relevant for Nissan with Bosch ME7 ECU systems).
  • 🔧 Check the engine weight - for Nissan Primera P12 she often moves away near the battery.

💡

On Nissans with VQ35DE engines (for example, Teana J31), error P0037 may be false due to the peculiarities of the ECU firmware. In this case, only flashing will help.

Common repair mistakes and how to avoid them

Many owners Nissan make typical mistakes that lead to reoccurrence P0037:

1. Replacing the sensor without checking the wiring

More 40% of cases repeated errors are associated with ignoring the condition of the wiring harness. For example, on Nissan Juke Wires often rub against the exhaust manifold bracket.

2. Using incompatible sensors

Universal lambda probes (e.g. Bosch 0 258 005 133) may not work correctly with the ECU Nissan. Always check the catalog for the VIN.

3. Ignoring code P0420

If P0037 accompanied by P0420, check the catalytic converter first. Installing a new sensor on a clogged catalyst will lead to its rapid failure.

4. Incorrect sensor installation

When replacing:

  • 🔧 Use special thread lubricant (For example, Liqui Moly Kupfer-Spray) to avoid sticking.
  • 🔩Tighten the sensor with torque 40–50 Nm - overstretching will damage the body.

⚠️ Attention: On Nissan with direct injection system (For example, Skyline V36) after replacing the sensor it may be necessary fuel system adaptation through a diagnostic scanner.

Cost of repairs in service vs. do-it-yourself repair

Elimination prices P0037 vary depending on the cause and model:

Type of work Cost (RUB) Time (hours)
Diagnostics with a scanner 1 000–2 500 0.5–1
Replacing the oxygen sensor 1,500–4,000 (with spare part) 1–1.5
Wiring repair 2 000–5 000 1.5–2
Catalyst cleaning/replacement 5 000–20 000 2–4
Flashing the ECU 3 000–8 000 1–2

Do-it-yourself repairs will be cheaper, but require skills:

  • 🔧 Replacing the sensor — 1,500–3,000 rub. (if you buy an analogue).
  • 🔧 Wiring repair — free, if you have a soldering iron and heat shrink.
  • 🔧 Diagnostics with a scanner — 0 rub. (if you have an ELM327 and a smartphone).

On Nissan with warranty repair by P0037 usually covered if the mileage is less than 100 thousand km. However, dealers often attribute the problem to “natural wear and tear” and refuse warranty service.

How to save on repairs?

If diagnostics show a sensor malfunction, but your budget is limited, try buying a used sensor at a disassembly facility (cost ~500–1,500 rubles). The main thing is that it comes from the same Nissan model and the donor's mileage does not exceed 80 thousand km. Check the heater resistance before purchasing!

FAQ: Frequently asked questions about error code P0037 on Nissan

Is it possible to drive with error code P0037?

Short term - yes, but not recommended. The engine will operate in emergency mode, which will lead to:

  • 🔥 Increased fuel consumption (+10–15%).
  • 🚗 Failures during acceleration.
  • 🌍 Possible damage to the catalyst.

If you ignore the error for more than 2-3 weeks, the risk of catalyst failure increases by 50%.

Why does P0037 appear after replacing the catalytic converter with a flame arrester?

Second oxygen sensor (Bank 1 Sensor 2) detects too high an oxygen content in the exhaust, since the flame arrester does not purify the gases. The ECU perceives this as a malfunction of the sensor heater. Solutions:

  • 🔧 Install decoy (mechanical or electronic).
  • 🖥️ Reflash the ECU for Euro-2 (disable control of the second sensor).
How can you tell the difference between a sensor failure and a wiring problem?

Take the test:

  1. Disconnect the sensor connector and check the heater resistance (normal: 2–10 ohms).
  2. If the resistance is normal, check the voltage at the connector (should be 12 V).
  3. If there is no voltage, the problem is in the wiring or fuse.

On Nissan with MR20DE engines (For example, Qashqai J11) the positive wire (orange) near the exhaust manifold often gets frayed.

Can P0037 go away on its own?

Yes, in two cases:

  • 🔌 If the problem was poor connector contact (for example, after washing the engine).
  • 🌡️ If the sensor is temporarily “soaked” after a long trip (relevant for dirty sensors).

However, in 90% of cases the error returns within 1–2 weeks. If P0037 disappeared after a reset, but then appeared again - the sensor or wiring is definitely faulty.

What other errors can accompany P0037?

Frequent combinations:

  • P0036 — open circuit of the heater.
  • P0038 — high level of heater signal (short circuit at +12 V).
  • P0420 — low catalyst efficiency.
  • P0136 — malfunction of the second sensor (signal out of range).

On Nissan Pathfinder R51 error P0037 often paired with P0430 (catalyst malfunction Bank 2).