Article 16546-4BA1B from Nissan - one of those details that raises a lot of questions among owners of Japanese cars. At first glance, a set of numbers and letters does not say anything, but behind it lies a critical component, without which the car may lose some functionality or even refuse to start. In this article we will not only decipher what this part is, but also figure out for which models Nissan it explains how to distinguish an original from a fake, and where is the most profitable place to buy it - without the risk of running into a counterfeit.

The peculiarity of this article is that it is universal for several lines Nissan, but at the same time it has compatibility nuances depending on the year of manufacture and configuration. For example, owners Qashqai And X-Trail it is often confused with parts that are similar in purpose, which leads to errors when ordering. We have collected all the relevant information, including unique data on cross-numbers and analogues that are not in standard catalogsso you can make informed choices.

What is 16546-4BA1B: technical description

Article 16546-4BA1B belongs to the category electronic components of the engine management system. More specifically, this is fuel pump relay module (or part thereof), which is responsible for supplying fuel to the injector. The part is a plastic case with contacts and internal electronics, which regulates the voltage at the fuel pump depending on the ECU signals.

Main characteristics of the part:

  • 🔌 Voltage: 12 V (standard for on-board network)
  • 🔧 Case material: heat-resistant plastic (usually ABS)
  • ⚡ Load current: up to 15 A (varies depending on model)
  • 📏 Dimensions: ~50×40×30 mm (exact dimensions depend on the revision)

The module works in conjunction with ECU (Engine Control Unit) and fuel pressure sensors. If it malfunctions, the driver may encounter symptoms such as:

  • 🚗 The engine stalls while driving or does not start
  • ⛽ Sharp drops in speed during acceleration
  • ⚠️ The dashboard lights up Check Engine (error code often P0190 or P0191)
Why does a part fail?

The most common causes of failure are oxidation of contacts (due to moisture), overheating (if the module is located next to hot parts of the engine) or manufacturing defects (rare, but found in batches of 2018–2019). In 80% of cases, the problem is solved by cleaning the contacts, but if the internal board is burned out, then only replacement.

What Nissan models is 16546-4BA1B suitable for?

This article is universal, but not for all versions Nissan. Below is a compatibility table indicating production years and features:

Model Years of manufacture Engine Notes
Nissan Qashqai (J10, J11) 2007–2021 1.6 (HR16DE), 2.0 (MR20DD) Only for versions with keyless entry
Nissan X-Trail (T31, T32) 2007–2020 2.0 (MR20DD), 2.5 (QR25DE) Not suitable for diesel versions
Nissan Juke (F15) 2010–2019 1.6 (HR16DE) The connector needs to be improved for versions 2015+
Nissan Note (E12) 2012–2020 1.2 (HR12DE) Only for European version

Important: Even if your model is on the list, check VIN code car through service Nissan Parts Catalog or at the dealer. For example, for 2018 Qashqai with engine 1.3 DIG-T (HR13DDT) this module doesn't fit - the article number is used there 16546-4BA2A.

📊 What Nissan do you have?
  • Qashqai
  • X-Trail
  • Juke
  • Note
  • Other model

Original vs analogues: what to choose?

Original part from Nissan is expensive - from 8,000 to 12,000 rubles depending on the region. However, there are analogues on the market that will cost 2–3 times less. But there are pitfalls here:

  • ⚠️ Counterfeit: Counterfeits of the original are often sold with labels "Made in Japan", but are actually made in China. You can distinguish them by the quality of the plastic (the original is matte, the fake is glossy) and markings (the original has laser engraving, the fake has paint).
  • 🔧 Incompatible analogues: Some brands (eg Febi or Meyle) offer “universal” modules that do not take into account the specifics of the ECU firmware Nissan.
  • ✅ Proven analogues: Reliable options include: Denso (article 550-0103) and Hitachi (REL-0032). They are certified for Nissan and have a 12 month warranty.

If you decide to save money, here is a checklist for checking the analogue:

Compare dimensions with the original (tolerance ±2 mm)

Check the markings on the case (must match the catalog)

Make sure the contacts are gold plated (this protects against oxidation)

Buy from an official distributor (list on the manufacturer’s website)

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⚠️ Attention: When installing a non-original module, you may need reset ECU adaptations via a diagnostic scanner (for example, Launch X431). Without this, the engine may operate unstably for the first 100–200 km.

Where to buy: official dealers vs online stores

Prices for 16546-4BA1B vary greatly depending on where you buy them. Below is a comparison of the main options:

Source Price (RUB) Pros Cons
Official dealer Nissan 10 000–12 000 100% original, 2 year warranty Long wait (if out of stock)
Exist.ru, Autodoc 6 500–9 000 Fast delivery, selection of analogues Risk of counterfeit (check reviews)
Avito, Yula 4 000–7 000 You can bargain No guarantee, high chance of counterfeit
AliExpress 2 500–4 000 Lowest price Delivery time 1–2 months, 90% fakes

Advice: if you buy on Exist.ru or Autodoc, pay attention to the country of origin in the product card. Original parts for Nissan are produced in Japan (country code JPN) or Thailand (THA). If specified CHN - It's a fake copy.

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Before purchasing, ask the seller to send a photo of the label with the article number and serial number. The original always has a 12-digit serial number starting with letters NS or NT.

How to replace 16546-4BA1B yourself?

Replacing a fuel pump relay module is a moderately complex operation that requires care and a minimal set of tools. Here are the step-by-step instructions:

  1. Disconnect the battery. Remove the negative terminal to avoid short circuit.
  2. Remove the rear seat. The module is usually located underneath, next to the gas tank (in Qashqai - left, in X-Trail - in the center).
  3. Disconnect the power connector. Press the latch and gently pull up. Don't pull the wires!
  4. Unscrew the mounting bolts. Usually this is 2 bolts per turnkey 10 mm.
  5. Install the new part. Check that the O-ring is intact (if necessary, replace it, part no. 16526-4BA0A).

After installation:

  • 🔧 Connect the battery and turn on the ignition (do not start the car!). Wait until the fuel pump pumps fuel (you will hear a characteristic buzzing sound).
  • 🚗 Start the engine and let it idle for 5-10 minutes. Check for fuel leaks.
  • 📱 Reset errors via diagnostic scanner (if lit Check Engine).
⚠️ Attention: If after replacement the engine does not start or runs jerkily, check connector polarity. There is a marking on the module "+B" And "FP" - don't confuse them!
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The most common mistake when replacing is damage to the O-ring. If it is torn or deformed, fuel will leak into the cabin, causing a fire hazard!

Common mistakes and how to avoid them

Even experienced car owners sometimes make mistakes when working with 16546-4BA1B. Here are the most common ones and how to prevent them:

  • 🔥 Ignoring ECU errors. If after replacing the module the indicator lights up on the dashboard Check Engine, do not reset the error "blindly". First check the codes with a scanner - perhaps the problem is not in the module, but in the fuel pressure sensor (P0193).
  • 💧 Moisture gets into the connector. When washing the engine or driving through deep puddles, water may seep into the contacts. To avoid this, treat the connector dielectric grease (For example, Liqui Moly Electronic-Spray).
  • ⚡ Mixed up wires. On some models Nissan (For example, Juke) the module connector has an asymmetrical shape, but inexperienced technicians try to connect it “by eye”. Always refer to the diagram included in service manual.

Another typical problem is Unstable engine operation after replacement. This may be due to:

  • Poor quality contact in the connector (check if the plugs are bent).
  • Incompatible ECU firmware (relevant for analogues).
  • Clogged fuel filter (change it together with the module, article no. 16400-4BA0A).

FAQ: answers to frequently asked questions

Is it possible to drive with a faulty module 16546-4BA1B?

Technically possible, but highly undesirable. A faulty module results in unstable fuel supply, which is fraught with:

  • Increased gasoline consumption (up to +20%).
  • Jerky acceleration and loss of power.
  • Overheating of the catalyst (due to incorrect air-fuel mixture).

In the long run this can be disabling. ignition coils or lambda probes.

How to check the 16546-4BA1B module for functionality?

There are two ways:

  1. Testing with a multimeter:
    • Set the diode test mode.
    • Connect the probes to the contacts 85 And 86 (relay coil). The resistance should be ~80 Ohms.
    • Connect the probes to 30 And 87 (load contacts). When 12 V is applied to the winding, a click should be heard.
  • Replacement with a known working module. If after replacing the problem disappears, your module is faulty.
    • Is 16546-4BA1B suitable for Nissan Almera G15?

    No, for Almera G15 (2012–2018) a different article is used - 16546-4M50A. Although the modules are similar in appearance, they have different firmware and are not interchangeable. Installation 16546-4BA1B on Almera will lead to an error P0627 (fuel pump relay circuit malfunction).

    Can the module be repaired instead of replaced?

    In most cases, no. Inside the module there is sealed board with relays and transistors, which cannot be soldered in garage conditions. The exception is oxidized contacts (they can be cleaned WD-40 and fine sandpaper). If the relay winding or microcircuit burns out, just replace it.

    Some workshops offer “repairs” by re-soldering the contacts, but such a module rarely lasts longer than 3-6 months.

    Where can I find the wiring diagram for my model?

    Official diagrams are in Nissan service portal (subscription required) or in manuals Haynes/Chilton. For quick access:

    • For Qashqai J11: look for the section Fuel System → Fuel Pump Relay.
    • For X-Trail T32: Engine Control → Power Distribution.

    Also, diagrams are often posted on forums (for example, Qashqai Club or X-Trail Su).