Error P0037 on Nissan: what it means, how to check and fix it

Error P0037 on your dashboard Nissan - this is a signal of problems with heating element of the oxygen sensor (lambda probe) in the first row (bank 1). Most often it appears on models Qashqai, X-Trail, Juke And Note with gasoline engines HR16DE, MR20DE or QR25DE. Unlike the classic error P0130 (low sensor signal), P0037 specifically indicates a malfunction of the heating circuit, and not the sensor itself.

If you ignore this code, the consequences can range from increased fuel consumption to damage to the catalytic converter - and replacing it will cost 50-150 thousand rubles. In this article we will look at why this occurs. P0037, how to diagnose it without a scanner, and what to do to fix it - from simply cleaning the contacts to replacing the sensor. You will also find a lambda probe compatibility table for popular models Nissan and answers to frequently asked questions.

What does error P0037 mean on Nissan?

Code P0037 stands for "Heated Oxygen Sensor (HO2S) Heater Control Circuit Low (Bank 1, Sensor 2)". Translation: low voltage in oxygen sensor heater control circuit (bank 1, sensor 2). Let's look at the key points:

• 🔍 Bank 1 - this is a row of cylinders where first cylinder (usually from the timing side). On 4-cylinder engines Nissan there is always one bank.
• 📊 Sensor 2 - this is lower lambda probe, located after the catalyst (unlike the top one, which stands before it).
• ⚡ Heating element in the sensor is needed to quickly bring it to operating temperature (300–400°C) after a cold start.

When the ECU (electronic control unit) detects that the voltage in the heating circuit is below normal (usually <0.3 V), it logs an error P0037. This may happen due to:

• 🔌 Break or short circuit in the heater wires.
• 🔥 Burnout of the heating coil inside the sensor.
• 🛠️ Poor contact in the connector or terminal oxidation.
• ⚡ Power supply problems (fuse, relay, ECU).

Symptoms of error P0037: how it manifests itself

Unlike errors in the fuel system (for example, P0300), P0037 often does not cause obvious handling problems. However, there are indirect signs:

• ⚠️ Check Engine lights up 5-10 minutes after starting (when the ECU checks the heater circuit).
• ⛽ Increased fuel consumption by 10–15% - due to the fact that the sensor takes longer to reach operating temperature, the ECU uses averaged data.
• 🔥 Jerking at idle with a cold engine (before the catalyst warms up).
• 📉 Dips during acceleration - if the error is combined with P0130/P0136 (low/high sensor signal).

Important: on some Nissan (For example, Qashqai J11 with motor MR20DD) error may appear only in wet weather - this indicates moisture has entered the sensor connector or damage to the wire insulation.

⚠️ Attention: If together with P0037 errors are on P0420 (low catalyst efficiency) or P0138 (high voltage heating circuit), most likely the sensor has completely failed and requires replacement.

Causes of P0037 on Nissan

To accurately determine the source of the problem, we will consider all possible causes - from the simplest to the complex:

Reason	How it manifests itself	Verification method
Oxidation of contacts in the sensor connector	The error appears periodically, especially in wet weather	Visual inspection, cleaning contacts with WD-40
Break or short circuit in the heater wires	Constant error, possible voltage surges	Continuity test with a multimeter (heater resistance ~2–10 Ohms)
The heating coil in the sensor has burned out	The error does not reset, the sensor is cold even after 10 minutes of operation	Heater resistance measurement (infinity = open)
Power problems (fuse, relay, ECU)	The error is accompanied by other codes along the power supply circuit	Checking the voltage at the sensor connector (should be ~12 V)
ECU or firmware malfunction	The error appears after flashing or repairing the ECU	Diagnostics with a scanner (checking sensor parameters in real time)

In practice 80% of cases errors P0037 associated with burnt out heater or damaged wiring. Less often, the connectors or the ECU are to blame. For example, on Nissan X-Trail T31 The wiring harness near the collector often suffers - it rubs against the bracket.

How to Diagnose P0037 Without a Scanner

To check, a multimeter and basic electrical skills are enough. Follow the step by step instructions:

1. Locate the oxygen sensor (bank 1, sensor 2).
   

   On 4-cylinder Nissan it is located after the catalyst (closer to the muffler). On V6 (Pathfinder, Murano) Bank 1 is the bank of cylinders on the 1st cylinder side.

2. Disconnect the sensor connector.
   

   Press the latch and carefully disconnect the block. Pay attention to the condition of the contacts - if they are green or black, they need to be cleaned.

3. Check heater resistance.
   

   Connect a multimeter in ohmmeter mode to the heater contacts (usually white and black wires). Normal resistance: 2–10 ohms. If the device shows 1 (break) or 0 (short circuit) - the sensor is faulty.

4. Check the supply voltage.
   

   Turn on the ignition (without starting the engine). Connect a multimeter in voltmeter mode to the heater power wires (usually +12 V on one contact, ground on the other). The voltage should be 11.5–12.6 V.

If there is power and the heater resistance is normal, the problem may be bad contact or signal wire damage (usually gray or purple). Ring him to the break.

Check the heater circuit fuse (usually F20 or F25 in the block under the hood)|

Clean the sensor connector contacts with alcohol or WD-40|

Measure heater resistance (should be 2-10 ohms)|

Check the supply voltage at the connector (11.5–12.6 V)|

Inspect the wires for chafing or melting -->

How to Fix Error P0037: Step-by-Step Solutions

Depending on the cause, repair methods range from basic to parts requiring replacement. Let's start with the simplest ones:

1. Cleaning contacts and checking wiring

If the error appears periodically, especially after rain:

• 🔧 Disconnect the sensor connector and clean the contacts isopropyl alcohol or WD-40 Contact Cleaner.
• 🔍 Check the wires for chafing (especially near the manifold or catalyst).
• 🛠️ If damage is found, insulate the wires heat shrink tube or replace the harness.

2. Replacing the oxygen sensor

If the heater is burnt out (resistance = ∞), the sensor must be replaced. For Nissan supplies original sensors NTK (number starts with 22690- or 226A0-). Analogues:

• 🔹 Bosch (the article depends on the model, for example 0 258 006 537 for Qashqai J10).
• 🔹 Denso (series DOX-0100 or DOX-0200).
• 🔹 NGK (numbers NTK 25177 or NTK 25187).

Important: when replacing, use special thread lubricant (For example, Liqui Moly Sensor-Fett) so that the sensor does not become stuck. Tighten with torque 40–50 Nm.

3. Checking the fuse and relay

On most Nissan The lambda probe heater circuit is protected by a fuse 15–20 A in the block under the hood (designation ECU-B or O2 Sensor). Also check the relay EFI (if any).

⚠️ Attention: On Nissan Juke (F15) with motor HR16DE The fuse for the lambda probe heater is combined with the fuel injector circuit. If it burns out, the engine may not start!

4. Checking the ECU and firmware

If all the previous steps did not help, the problem may be control unit or its firmware. This is true for cars after chip tuning or ECU repair. In this case:

• 🔧 Reset adaptations via diagnostic scanner (eg Launch X431).
• 📥 Reflash the ECU to the stock version (if there was chip tuning before).
• 🛠️ Check the heater control circuit from the ECU to the sensor (the wire or contact in the unit connector may be damaged).

Cost of repairs and selection of spare parts

The cost of solving the problem depends on the cause and model of the car. Here are the estimated costs:

Type of repair	Cost (RUB)	Notes
Cleaning contacts	0–300	WD-40 + time. If the contacts are heavily oxidized, the connector may need to be replaced (~1,500 rubles).
Wiring repair	500–3 000	Depends on the length of the damaged area. Heat shrink + soldering iron or replacement harness.
Replacing the oxygen sensor (analog)	2 500–6 000	Bosch/Denso for Qashqai/X-Trail. Original NTK — 8,000–12,000 rub.
Diagnostics at a service station	1 500–3 000	Includes scanning with a scanner, continuity testing of circuits and consultation.
ECU replacement or flashing	10 000–30 000	Relevant in case of damage to the unit or incorrect chip tuning.

Advice: if you choose an analogue sensor, pay attention to number of wires (4 or 5) and connector type. For example, on Nissan Note E12 with motor HR16DE fits Bosch 0 258 006 537, and on X-Trail T32 with MR20DD — Denso DOX-0200.

How to distinguish an original NTK sensor from a fake?

Original sensor NTK for Nissan has:

1. Logo NTK or NGK on the body (not a sticker!).

2. Labeling with the part number corresponding to the catalog (for example, 22690-4M000 for Qashqai J10).

3. Factory packaging with a hologram and an article number that matches the invoice.

4. Burr-free threads and high-quality anti-corrosion coating.

Counterfeits often have dull metal, crooked markings and no logo on the case.

Frequently asked questions about error code P0037 on Nissan

Is it possible to drive with error code P0037?

In the short term - yes, but this will lead to:

• 🛢️ Increased fuel consumption (up to +15%).
• 🔥 Risk of damage to the catalyst (if the sensor is completely inoperative).
• ⚠️ Possible problems with passing maintenance (if the error is active).

It is not recommended to drive for a long time - it is better to eliminate the cause within 1-2 weeks.

How to reset error P0037 without a scanner?

There are two ways:

1. Disable negative battery terminal for 10–15 minutes (the ECU will reset the errors).
2. On some models (for example, Nissan Almera G15) you can reset errors via service menu:

   1. Включите зажигание (не запуская двигатель).
   2. Нажмите и удерживайте кнопку сброса суточного пробега.
   3. Через 5 секунд нажмите её ещё раз (появится сервисное меню).
   4. Выберите пункт "Erase DTC" (удалить ошибки).

If the error appears again, the problem has not been resolved.

Why does P0037 only appear in wet weather?

This is a typical sign:

• 💧 Moisture getting into sensor connector (oxidation of contacts).
• 🔌 Damage wire insulation (short circuit to ground).
• 🛠️ Leaks ECU pads (water enters the block).

Solution: treat the connectors WD-40 or Liqui Moly Electronic-Spray, check the wires for integrity.

Is it possible to clean the oxygen sensor instead of replacing it?

Cleaning is possible, but not always effective. Methods:

• 🧹 Mechanical cleaning: Remove carbon deposits from the protective cap with a soft brush (do not damage the ceramic element!).
• 💧 Dry cleaning: soak the sensor in phosphoric acid for 10-15 minutes, then rinse with water.

Important: cleaning only helps if the problem is pollution, and not in a burnt-out heater. If the spiral resistance = ∞, the sensor must be replaced.

What errors often accompany P0037?

If together with P0037 other codes are lit, this narrows the search range:

• P0130/P0136 — the sensor itself is faulty (not just the heater).
• P0138 — high voltage in the heating circuit (possible short circuit at +12 V).
• P0420 — low efficiency of the catalyst (the sensor after it does not work).
• P0171/P0174 — lean mixture (may be due to incorrect data from the lambda probe).