Nissan Almera Classic rear left ABS sensor: diagnostics, replacement and selection of the original

ABS sensor on Nissan Almera Classic (body B10, 2006–2012) is a critical element of the braking system, responsible for the correct operation of the anti-lock braking system. A malfunction of the rear left sensor is manifested not only by a burning lamp ABS on the dashboard, but also by worsening handling on slippery roads and increasing braking distance. Unlike front sensors, rear sensors more often suffer from corrosion of connectors and mechanical damage due to their proximity to the road surface.

In this article we will analyze signs of troublelike check the sensor with a multimeter without removal, detailed replacement instructions with photos, as well as original articles and analogues. Let us separately dwell on typical installation errors that lead to repeated failure of the sensor after 1–2 months. If you notice that the brake pedal has become “wobbly” or the ABS is activated for no reason, this information will help you save on diagnostics at the service center.

Signs of a malfunction of the rear left ABS sensor on Almera Classic

Symptoms of a broken ABS sensor are often confused with brake pad or wheel bearing problems. However there is specific signs, which directly point to the rear left wheel sensor:

• 🔴 ABS light is on on the dashboard (sometimes flashes when driving). On Almera Classic The error code can be read via the diagnostic connector or scanner ELM327.
• 🚗 Rear wheel lock when braking hard (especially on wet or icy roads). ABS stops regulating the pressure in the circuit.
• 🔊 Grinding or knocking from the rear left wheel at a speed of 40–60 km/h. Often caused by damage ring gear on the hub (a unique problem for Almera Classic with mileage >150 thousand km).
• 📉 Increased braking distance while maintaining the effectiveness of the front brakes. The rear wheels lock earlier than they should.

Important: if the ABS light only comes on when turning left or after driving through a puddle - a problem with a high probability of sensor connector, and not in the sensor itself. Water gets into the contacts, causing a short circuit.

⚠️ Attention: On Nissan Almera Classic with engines 1.5 (K4M) And 1.6 (HR16DE) a faulty ABS sensor can lead to false ESP activation (if the system is installed). This is due to the integration of control units.

How to check the ABS sensor with a multimeter without removing it

Diagnostics of the rear left wheel sensor on Almera Classic takes 10–15 minutes and does not require a lift. You will need:

• 🔧 Multimeter (resistance and voltage modes).
• 🔌 Screwdriver with a flat blade (for disconnecting the connector).
• 🧲 Magnet (for checking inductance).

Check procedure:

1. Disconnect the sensor connector (located on the shock absorber strut, closer to the wheel). Clean contacts from oxidation with alcohol.
2. Measure resistance between the sensor terminals. Norm for Almera Classic: 800–1400 Ohm. If the readings 0 ohm (short circuit) or ∞ (break) - the sensor is faulty.
3. Check inductance: bring the magnet to the end of the sensor. A working sensor should change the resistance by 5-10%.
4. Ring the wiring from the connector to the ABS unit (located under the hood, next to the vacuum booster). The wire resistance should not exceed 1–2 Ohm.

If the sensor shows normal resistance, but the ABS light is on, the problem may be:

• 🔌 Oxidized contacts ABS unit connector (clean only with special liquid, not WD-40!).
• 🛠️ Damaged tooth on the hub crown (checked visually after removing the wheel).
• 🖥️ Faulty ABS unit (requires diagnostics with a scanner).

Original articles and analogues of the ABS sensor for Almera Classic

For rear left wheel Nissan Almera Classic (B10) Sensors with the following article numbers are suitable:

Type	Article	Manufacturer	Price, ₽	Notes
Original	40520-BM400	Nissan	3 200–4 500	Best quality, but often counterfeited
Analogue	ADS50104	Febi Bilstein	1 800–2 300	Good compatibility, 1 year warranty
Analogue	25372	TRW	2 100–2 600	Corrosion resistant, comes with new mounting
Budget	ABD0004	Blue Print	1 200–1 500	Suitable for temporary replacement, resource ~30 thousand km

When choosing an analogue, pay attention to:

• 🔧 Wire length - on Almera Classic the original sensor has a wire length 45 cm. A short wire will complicate installation.
• 🧲 Mounting type - sensors are available on bolt (original) or latch (cheap analogues). Bolt fastening is more reliable.
• 📦 Complete set - included in the original set new retaining ring and lubricant for the connector.

⚠️ Attention: ABS sensors for Almera Classic And Nissan Note (body E11) externally identical, but have different calibrations. Installing the sensor from Note will lead to false ABS alarms at speeds above 80 km/h.

Step-by-step replacement of the rear left wheel ABS sensor

Replacing the sensor with Almera Classic takes 30–40 minutes. You will need:

• 🔧 Key on 10 mm (for fastening bolt).
• 🔧 Socket wrench on 17 mm (to remove the wheel).
• 🧴WD-40 or contact liquid (For example, Kontakt 60).
• 🧲 Magnet (to remove the bolt if it falls).

Instructions:

1. Remove the wheel and clean the area around the sensor. On Almera Classic the sensor is located on hub unit, next to the drive shaft.
2. Disconnect the connector sensor If the contacts are oxidized, treat them Kontakt 60 (do not use sandpaper!).
3. Unscrew the fastening bolt key on 10 mm. Be careful - the bolt often sticks. If it doesn't work, apply WD-40 and wait 5 minutes.
4. Remove the sensor, gently rocking it from side to side. Don't pull the wire!
5. Install a new sensor, secure with a bolt (tightening torque - 8–10 Nm). Connect the connector.
6. Check your work: Start the car and drive 5–10 meters. The ABS lamp should go out after 1–2 km (the error must be reset).

If the ABS lamp does not go out after replacement:

• 🔧 Check it out connection polarity (there are marks on the sensor «+» And «–»).
• 🖥️ Reset the error via scanner or disconnecting the battery for 10 minutes.
• 🔍 Make sure that gap between sensor and hub ring does not exceed 1 mm.

What to do if the sensor mounting bolt breaks?

If the bolt breaks off, use extractor or drill it out with an 8mm drill. As a last resort, you can cut a new thread M12, but this will require disassembling the hub.

Typical replacement mistakes and how to avoid them

Even experienced car owners make mistakes that lead to repeated sensor failure or incorrect ABS operation. Here are the most common:

• 🔧 Tightening the fastening bolt — leads to deformation of the sensor body. The tightening torque should not exceed 10 Nm.
• 🧴 Using WD-40 to Clean Contacts — leaves a film that impairs conductivity. Use only alcohol or Kontakt 60.
• 🔌 Connecting a sensor with a twisted wire - leads to wire breakage after 1–2 months. The wire should lie freely, without tension.
• 🚗 Ignoring checking the hub crown — chipped teeth cause false ABS alarms even with a new sensor.

How to check the hub crown:

1. Remove the wheel and brake disc.
2. Inspect the ring gear for chips, cracks or wear.
3. Rotate the hub by hand - if you feel beating or uneven rotation, the crown must be replaced.

⚠️ Attention: On Almera Classic with mileage >200 thousand km often wears out wheel bearing, which leads to play and damage to the ABS sensor. If the problem persists after replacing the sensor, check the wheel play (permissible play is 0.15 mm).

Resetting ABS error after replacing sensor

After installing a new sensor, the ABS light may remain on until the error is cleared. On Nissan Almera Classic there are three ways to do this:

• 🔧 Battery disconnection:
  1. Remove the negative terminal from the battery.
  2. Press the brake pedal 5-6 times (discharges the capacitors in the ABS unit).
  3. Wait 10 minutes and reconnect the terminal.
  4. Start the car and drive 1-2 km - the lamp should go out.
• 🖥️ Scanner ELM327:
  1. Connect the scanner to the connector OBD-II (under the steering wheel).
  2. In the program (for example, Torque Pro) select ABS → Clear DTC.
• 🔧 Manual reset (for Almera Classic before 2009):
  1. Turn on the ignition (do not start the car).
  2. Press the brake pedal and hold for 10 seconds.
  3. Release the pedal and turn off the ignition.
  4. Repeat 3 times.

If the ABS light does not go out after resetting:

• 🔍 Check it out wiring integrity from the sensor to the ABS block (often frays near the shock absorber strut).
• 🖥️ Read errors with a scanner - if a code appears C1130 (hydraulic pump malfunction), the problem is in the ABS unit.

Frequently asked questions about the ABS sensor Nissan Almera Classic

Is it possible to drive with a faulty ABS sensor?

Technically yes, but this dangerous. ABS is turned off completely, and during emergency braking, the rear wheels can lock, which will lead to a skid. On wet or icy roads, braking distance increases by 20–30%. In addition, on Almera Classic with ESP, the stabilization system also stops working.

How to distinguish an original ABS sensor from a fake?

Original sensor 40520-BM400 has:

• 🏷️ Laser engraving article number on the case (not a sticker!).
• 🔧 Mounting bolt with hex key 10 mm (fakes often have 8 mm).
• 🧵 Rubber seal on the connector (analogues have plastic).
• 📦 box with Nissan hologram and barcode.

Counterfeits often have duller metal and the smell of plastic.

Why does the ABS light come on again after a week after replacing the sensor?

Reasons:

• 🔌 Oxidation of contacts in the ABS unit connector (needs to be cleaned Kontakt 60).
• 🚗 Wheel bearing play (check wheel play).
• 🔧 Incorrect installation — the sensor touches the hub crown (the gap should be 0.5–1 mm).
• 💧 Water ingress into the connector (seal the connection with silicone grease).

Can the ABS sensor be repaired or is it just a replacement?

ABS sensor - irreparable node Its body is sealed, and attempts to disassemble it will damage the winding. The only thing that can be restored is:

• 🔌 Connector contacts (cleaning and soldering).
• 🧵 Wiring (if the wire is frayed).

If the sensor itself (inductive coil) fails, it must only be replaced.

What ABS error codes indicate a problem with the rear left sensor?

On Nissan Almera Classic The following errors are responsible for the rear left sensor:

• C1105 — open circuit of the sensor.
• C1110 - short circuit.
• C1115 — incorrect signal (often due to a damaged hub crown).
• C1135 — discrepancy between the signals of the front and rear sensors (wiring problem).

Codes C1140 and above refer to the ABS hydraulic unit.