How to replace the reverse sensor on a Nissan Almera G15: detailed instructions with photos and tips

Reverse sensor on Nissan Almera G15 - a small but critical element that is responsible for turning on the white lights when reversing. Its malfunction not only creates inconvenience when parking at night, but can also result in a fine for non-working lighting devices. In 90% of cases, the problem is solved by replacing the sensor, which is quite possible to do yourself - without visiting a service center and overpaying for the work.

In this article you will find step-by-step instructions with photos, a list of necessary tools, tips for choosing an original or analog sensor, as well as typical mistakesthat beginners make when replacing. We will figure out why the sensor fails, how to check it with a multimeter, and what to do if, after installing a new element, the lights still do not work. We will pay special attention to the nuances for cars with automatic transmission and manual transmission - the replacement procedure is different for them!

Signs of a malfunctioning reverse sensor on a Nissan Almera G15

The first and most obvious symptom is Reverse lights do not turn on when moving the lever to the "R" position. However, the problem can manifest itself in another way:

• 🔦 The lights are constantly on, even when the car is in neutral or moving forward.
• 🔄 The lamps blink or light up with a delay (typical of oxidized sensor contacts).
• 🚨 Lights up on the dashboard Check Engine (rare, but possible with a short circuit in the circuit).
• 🔊 Extraneous sounds (clicks, crackles) from the gearbox area when engaging reverse gear.

On Almera G15 with CVT a faulty sensor can also cause jerking when switching to "R" - this is due to the fact that the transmission ECU does not receive the correct signal about the gear being engaged. If you notice at least one of these signs, do not rush to change the lamps or check the fuses - in 80% of cases the sensor is to blame.

⚠️ Attention! On vehicles produced from 2019 to 2023, the reverse sensor is integrated into the unit with the speed sensor. If the lights do not work, but the speedometer shows correct data, the problem is definitely in the reverse sensor. If the speedometer “lies” or does not work at all, the entire unit will need to be replaced.

Which reverse sensor to choose: original or analogue?

Original sensor for Nissan Almera G15 has an article number 39200-4M000 (for manual transmission) and 39200-4M001 (for automatic transmission/variator). Its average price at official dealers is 2,500–3,800 rubles. However, there are proven analogues that will cost less:

Manufacturer	Article	Price, ₽	Features
Febi	22310	1 200–1 500	High-quality rubber, but sometimes the seal fails
ERA	550455	900–1 100	Budget option, may require modification of the seal
Blue Print	ADN12310	1 400–1 700	Good price/quality ratio, suitable for automatic transmission
Valeo	401318	1 800–2 200	Premium analogue, close to the original in terms of resource

When choosing, pay attention to O-ring material - with cheap analogues it often becomes tanned in the cold, which leads to oil leaks. Also check rod length: on Almera G15 with manual transmission it is shorter than on versions with automatic transmission. If you buy a sensor of the wrong modification, it will either not screw in completely or will not operate when the gear is engaged.

💡 Advice: Before purchasing, remove the old sensor and compare it with the new one - they should match in terms of:

• 📏 Length of the threaded part (22 mm for manual transmission, 25 mm for automatic transmission).
• 🔧 Connector type (on Almera G15 a 2-pin connector is used).
• 🟢 The color of the wire (usually black with a green stripe).

Tools and materials for replacement

To work you will need:

• 🔧 22 mm socket (or socket wrench) - necessarily with an extension cord, since access to the sensor is limited.
• 🔩 Ratchet handle or crank.
• 🔌 Screwdriver with a flat blade (for snapping off the connector chip).
• 🧴Sealant Loctite 577 or ABRO 11-AB (for thread processing).
• 🧻 A rag and contact cleaner (e.g. CRC Contact Cleaner).
• 🔋 Multimeter (to check the new sensor before installation).
• 🚗 Jack and stops (if you are working without a pit or lift).

⚠️ Attention! On Nissan Almera G15 with variator You cannot lift the car by the front end without support for the rear wheels - this can damage the transmission. Use only certified supports or trestle.

If you don't have a 22mm socket, you can try using adjustable wrench, but this increases the risk of “licking” the edges of the sensor. In extreme cases, an open-end wrench will also work, but it is inconvenient to work with due to limited space.

Remove the negative terminal from the battery|Raise the car on a jack or drive it into a pit|Clean the sensor and the area around it from dirt|Prepare a new sensor and sealant|Check the operation of the reversing lights before starting work (to confirm the malfunction)-->

Step-by-step instructions for replacing the reverse sensor

The replacement procedure takes 20–40 minutes depending on experience and conditions (pit/jack). Follow the instructions strictly step by step to avoid mistakes:

1. Preparing the car. Turn off the engine, put the car on the handbrake and disconnect the negative terminal of the battery (this will prevent a short circuit when disconnecting the connector). If you are using a jack, support the rear wheels with jack stands.

2. Access to the sensor. On Almera G15 the sensor is located on gearbox from the driver's side. On a manual transmission it is screwed into the upper part of the crankcase, on an automatic transmission/variator - closer to the rear of the box. For convenience, you can remove air filter (unscrew 3 bolts 10 mm).

3. Disconnecting the connector. Press the latch (usually a plastic tab) and carefully release the pad. If the connector is stuck, do not pull it - spray it WD-40 and wait 5 minutes. Check the condition of the contacts: if they are oxidized, clean them CRC Contact Cleaner.

4. Removing the old sensor. Place the 22mm socket on the sensor and unscrew it counterclockwise. Be careful: a little oil (10-20 ml) may leak at the end of the thread - this is normal. If the sensor does not respond, do not apply excessive force - it is better to re-process the thread WD-40.

5. Installing a new sensor. Apply a thin layer of sealant to the threads of the new sensor (not to the contacts!). Screw it in by handso as not to distort, then tighten with the key. Tightening torque - 30–40 Nm (do not overtighten!).

6. Connection and testing. Connect the connector until it clicks, return the air filter (if removed) and connect the battery. Start the car, put the car in reverse and check that the lights work. If they do not light up, see the section "What to do if the lights do not work after replacing the sensor."

🔧 Important! On Almera G15 with a variator, after replacing the sensor it may be necessary reset box adaptations. To do this:

1. Start the engine and warm it up to operating temperature.
2. Switch on all gears one by one (P → R → N → D) with a delay of 5 seconds in each position.
3. Drive 5–10 km at a leisurely pace, avoiding sudden acceleration.

What happens if the sensor is not replaced?

In addition to non-functioning lights, ignoring the problem can lead to:

- Moisture entering the box through a leaky sensor (especially important for automatic transmissions).

- Short circuit in the circuit if the sensor contacts are shorted to ground.

- Problems with passing technical inspection (non-working reverse lights are a reason for refusal).

How to check the reverse sensor with a multimeter

If you are not sure that the problem is with the sensor, you can check it without removing it from the car. You will need multimeter in continuity or resistance measurement mode:

1. Disconnect the connector from the sensor. There are two contacts on the block: one goes to mass, the second - on reverse lamps.

2. Set the multimeter to mode resistance (200 Ohm) and connect the probes to the sensor contacts. When turned off Reverse gear resistance should be endless (open circuit).

3. Ask an assistant to engage reverse gear. Resistance should drop to 0–5 Ohm (the circuit is closed). If the readings do not change, the sensor is faulty.

4. Check the circuit from the sensor to the lamps: one multimeter probe to the connector contact, the second to the body ground. When reverse gear is engaged there should be 12 V. If there is no voltage, the problem is in the wiring or fuse.

⚠️ Attention! On Almera G15 with CVT the sensor may show resistance 10–20 Ohm even with the gear turned off, this is normal due to the design features. The main thing is that when you turn on "R" the resistance drops to 0–1 Ohm.

If you don’t have a multimeter, you can check the sensor for spark:

1. Remove the connector from the sensor.
2. Turn on the ignition and reverse gear.
3. Briefly short-circuit the connector contacts with a screwdriver. If the lamps light up, the sensor is faulty.

Be careful! With this method there is a risk of burning the fuse F37 (10A) in the block under the hood.

- Fuse F37 (10A) in the engine compartment.

- Relay K20 (reverse relay) - located there.

- Integrity of the wiring from the sensor to the lamps (often frays near the corrugation under the bottom).-->

What should I do if the lights do not work after replacing the sensor?

The situation when the reversing lights do not turn on after installing a new sensor occurs in 15–20% of cases. The reasons may be as follows:

• 🔌 Incorrect connector connection. Make sure the chip is seated until it clicks. Sometimes the contacts in the block bend - check them with a flat-head screwdriver.
• 🔋 The fuse has blown. If there was a short circuit during replacement, it could burn out. F37 (10A). Check it and replace if necessary.
• 🔧 The sensor is of the wrong modification. For example, we installed a sensor for a manual transmission on an automatic transmission. Compare the part numbers of the old and new sensor.
• 📉 Break in the wiring. Wires often fray around corrugations under the bottom or at the entrance to the salon. Test the circuit with a multimeter.
• 💡 Lamps are faulty. Yes, it happens! Check the reversing lamps (on Almera G15 used W16W).

If all of the above are fine, but the lights do not work, the problem may be:

• Body Control Module (BCM). On Almera G15 it sometimes "glitches" after disconnecting the battery. The solution is to reset the errors using a scanner or disconnect the battery for 10 minutes.
• Reverse relay (K20). Located in the underhood fuse box. Try replacing it with a known good one (for example, with a turn signal relay).

💡 Advice: If after replacing the sensor the Check Engine, reset the error using a scanner or disconnecting the battery. On Almera G15 with a CVT it may be necessary to adapt the throttle valve (done through Nissan Consult or Launch X431).

Common mistakes when replacing a reverse sensor

Even experienced car owners sometimes make mistakes that lead to repeated replacements or additional problems. Here are the most common:

• 🛠️ Pulling the sensor. Excessive tightening torque (more than 40 Nm) can damage the threads in the aluminum transmission housing. Symptom: the sensor screws in “tightly” or oil begins to leak after replacement.
• 🔧 Using the wrong sealant. Silicone sealants (eg. ABRO Red) are not suitable - they corrode aluminum. Use only Loctite 577 or Permatex 59214.
• 🔌 Damage to the connector. When disconnecting the chip, do not pull the wires - grab the plastic case. If the latch is broken, the block can be secured with electrical tape (temporary solution).
• 🚗 Replacement without disconnecting the battery. This is fraught with a short circuit if you accidentally short the sensor contacts to ground. Always remove the negative terminal before work!
• 🔍 Ignoring oil leaks. If, after removing the sensor, ATF (on an automatic transmission) or transmission oil (on a manual transmission) leaks from the hole, do not rush to screw in a new sensor. First check the oil level and add if necessary.

⚠️ Attention! On Nissan Almera G15 with variator Replacing the reverse sensor without resetting the box adaptations can lead to jerking when switching to “R”. If shocks appear after replacement, perform the adaptation procedure (see the “Step-by-step instructions” section).

Another common mistake is buying a sensor based on appearance, and not by article. For example, sensors for Nissan Note or Micra may be identical in appearance, but have a different “filling”. Always check the catalogs Nissan or Denso.

FAQ: Frequently asked questions about replacing the reverse sensor

Is it possible to drive with a faulty reverse sensor?

Technically, yes, but it is unsafe and fraught with a fine. According to traffic rules (clause 19.1), in the dark or in conditions of insufficient visibility necessarily Reversing lights must be turned on. Fine - 500 rubles (Article 12.20 of the Administrative Code). In addition, without working lights, you risk causing an accident when parking.

How much oil leaks when replacing a sensor?

When carefully removing the sensor, oil loss is minimal - 10–30 ml. This is not critical for a manual transmission, but for an automatic transmission/variator it is better to top it up immediately Nissan CVT Fluid NS-3 to the level. If oil gushed out, it means the sensor was unscrewed too quickly or the car was parked on an incline.

What sealant should I use for the sensor?

For threaded connection of the reverse sensor on Almera G15 fit:

• Loctite 577 (optimal option, withstands vibration and temperature).
• Permatex 59214 (analogue Loctite, but cheaper).
• ABRO 11-AB (budgetary, but requires re-processing after 1–2 years).

Do not use silicone sealants (ABRO Red/Black) - they are not intended for threaded connections in transmissions!

Do I need to reset errors after replacing the sensor?

On Almera G15 with CVT — necessarily, since the transmission ECU may record an error P0705 (sensor circuit malfunction). On a manual transmission, a reset is usually not required, but if the light comes on Check Engine, the error must be erased. This can be done:

• Via diagnostic scanner (Launch X431, Autel).
• Disconnecting the battery for 10–15 minutes (does not always work).
• In some cases, the error resets itself after 2-3 ignition cycles.

Can an old sensor be repaired?

In 99% of cases the reverse sensor beyond repair — its body is sealed, and the internal structure (reed switch) cannot be restored. The exception is if the problem is oxidized contacts connector. In this case you can:

1. Clear contacts CRC Contact Cleaner.
2. Bend the tabs in the chip for better contact.
3. Insulate the connector with heat shrink (if the insulation is damaged).

But even after this, the sensor will not last long - it is better to immediately replace it with a new one.