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2013-2019 Nissan Sentra 1.8L MRA8DE Engine: Problems, Identification, and Used Replacement

The 1.8L MRA8DE is a reliable engine often misdiagnosed for CVT failures, but timing chain stretch and cracked cylinder heads can kill it. Learn how to identify your engine, what fails, and when swapping in a used OEM unit makes the most financial sense.

22 minutes to read 2013-2019 Nissan Sentra

Difficulty

5/5

Est. Time

15 hrs

DIY Doable?

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$1,200 - $3,600

Used OEM Price

$250 - $1,700

⚠️ Drivable, but... — Driving is possible with some symptoms like minor oil consumption or a check engine light, but symptoms like stalling or a rattling timing chain warrant immediate attention to prevent catastrophic failure.

Key Takeaways

Before replacing the engine for hesitation or stalling, have a technician thoroughly diagnose the CVT, as it is a very common failure point and its symptoms mimic engine problems.
To prevent cracking the aluminum cylinder head, spark plugs must be tightened to a strict 14 ft-lbs with a torque wrench on a completely cold engine.
Verify fitment by checking that the 4th digit of the VIN is 'A', and always transfer the original intake/exhaust manifolds, sensors, and wiring harness to the replacement engine to ensure emissions compatibility.
After installation, an Idle Air Volume Learning (IAVL) procedure using a professional scan tool is mandatory to correct a high or surging idle.

The MRA8DE is a 1.8-liter, naturally aspirated, inline 4-cylinder gasoline engine that served as the standard powerplant for all non-turbo Nissan Sentra models from 2013 to 2019. It uses conventional port fuel injection and was designed exclusively for front-wheel-drive (FWD) applications. Its primary function is to convert the chemical energy in gasoline into mechanical energy to propel the vehicle.

Is This the Right Engine for Your Sentra?

A complete 1.8L MRA8DE engine assembly for a 2013-2019 Nissan Sentra on an engine stand. — The 1.8L MRA8DE (MRA8) engine was the standard power plant for all non-turbo Nissan Sentras from 2013 to 2019.

The engine bay of a 2013-2019 Nissan Sentra showing the 1.8L MRA8DE engine layout. — Before replacing the engine, inspect the 1.8L MRA8DE for common issues like oil consumption or timing chain rattle, and rule out CVT transmission failure.

This engine, part of the Nissan MR family, is the 1.8-liter inline 4-cylinder MRA8DE (also identified by codes MRA8 or MR18DE). It was the standard engine for all non-turbo Nissan Sentra models from 2013 to 2019. It is a non-turbo, non-direct-injection engine used only in front-wheel-drive (FWD) applications.

Confirming Fitment: The VIN Check

The most important step before purchasing a replacement engine is to check your vehicle's VIN (Vehicle Identification Number). The VIN is a 17-digit code found on a plate at the bottom of the driver's side windshield and on a sticker in the driver's door jamb.

The 4th digit of your VIN must be 'A'. This confirms your Sentra was built with the 1.8L MRA8DE engine. [4]
Confirm your Transmission Type: Note whether your Sentra has a CVT (Continuously Variable Transmission) or a 6-speed manual transmission to prepare for the flywheel or flexplate transfer.

Warning: This engine will NOT fit Sentra SR Turbo or NISMO models, which use a 1.6L turbocharged engine. It also does not fit the Nissan Versa, which uses a different engine family.

California (SULEV) vs. Federal Emissions

A critical detail for these engines is the emissions package. You can find your vehicle's emissions certification on a label under the hood. Many used engines come from California-certified vehicles (SULEV - Super Ultra Low Emission Vehicle).

You can install a California-spec engine into a Federal-spec car.
However, to avoid an immediate check engine light, your mechanic must transfer the original intake manifold, exhaust manifold, fuel injectors, and emissions sensors from your old engine to the replacement unit.

Is Your Sentra's Engine Failing?

Several symptoms can point to a failing engine, but it's important to rule out other causes first, especially issues with the Continuously Variable Transmission (CVT), which are common in this generation of Sentra. [22]

Hesitation or Stalling: While this can be an engine issue, it is very often a symptom of a failing CVT. [1, 11] A judder, shake, or hesitation on acceleration is a classic sign of the CVT problems described in Nissan's technical service bulletins. [1, 13]
Rattling Noise on Startup: A brief but noticeable rattle when the engine is first started cold often indicates a stretched timing chain. This typically occurs on higher-mileage units (over 120,000 miles).
Excessive Oil Consumption: If you frequently need to add oil between changes or notice blueish smoke from the exhaust, the engine may have worn or stuck piston rings. A clogged PCV (Positive Crankcase Ventilation) valve can also cause this.
Check Engine Light: Numerous codes can appear. A common one is P0101, which can be triggered by a faulty PCV valve. [31, 43] EVAP system codes like P0442, P0455, or P0456 are also frequent and often caused by a simple vent control valve O-ring failure.

Pro Tip: Before condemning the engine for hesitation or lack of power, have a qualified technician investigate the CVT. 🎬 Watch: Understanding CVT shudder and how to fix it Many engine replacements have been performed when the actual fault was the transmission. [1, 22]

Factory Service Bulletins (TSBs) & Service Campaigns

Side-by-side comparison of a clean new PCV valve versus a carbon-fouled, clogged PCV valve. — A clogged PCV valve (right) can lead to stalling and oil consumption; Nissan issued a campaign to replace the original orange valves with updated versions.

Nissan has issued several bulletins and campaigns to address common issues with this engine and related systems. Knowing these can help in diagnosis.

Bulletin / Campaign	Details
CVT Judder and Hesitation (TSB NTB19-075 / NTB17-034)	Vehicles: 2013-2019 Sentra. [1, 11] Symptom: A shake, shudder, vibration, or hesitation during acceleration, often misdiagnosed as an engine misfire. [1, 13] Remedy: Diagnose JATCO CVT slippage, which may lead to valve body or full transmission replacement. [13]
Voluntary Service Campaign – PCV Valve & ECM Reprogram	Vehicles: 2013-2017 Sentra. [5] Symptom: Low-speed stalling, especially in high-temperature, high-altitude conditions. [6] Remedy: For 2013-2014 models, the original orange-colored PCV valve is replaced with an updated black version, and the Engine Control Module (ECM) is reprogrammed. [5] For 2015-2017 models, only an ECM reprogram is performed. [5]
Check Engine Light (MIL) with DTC P0101 (TSB NTB17-039)	Vehicles: 2013-2015 Sentra. [31] Symptom: The check engine light is on with code P0101 stored, but no noticeable driving issues. [31, 35] Remedy: For 2013-2014 models, inspect the PCV valve and replace it if it is the old orange style. [31] For all affected years, the procedure involves cleaning the electronic throttle chamber and reprogramming the ECM. [35]

Warning: The Spark Plug Torque Trap. The aluminum cylinder head on the MRA8DE is notoriously prone to cracking if spark plugs are over-tightened. Always use a precision torque wrench and a 14mm thin-wall 12-point spark plug socket to tighten to a strict 14 ft-lbs (19.6 Nm). Never perform this service on a warm or hot engine, as the aluminum is more susceptible to damage.

Engine Replacement Cost Comparison

The cost of replacing a Sentra engine varies based on the type of replacement unit and local labor rates. Labor typically takes between 10 and 20 hours. [25]

Part or Service	Estimated Cost (USD)
Used OEM Engine	$250 - $1,000 [4, 7, 16]
Remanufactured Engine	$2,500 - $4,500 [14, 15]
New OEM Engine	$4,000 - $7,500+ [3, 25]
Installation Labor	$1,200 - $3,600 [25]

Diagnostic Flowchart

This flowchart helps determine if your Sentra's MRA8DE engine is failing or if the issue lies with the CVT, PCV system, or external sensors based on factory service bulletins and common failure patterns.

Has a technician investigated the JATCO CVT for slippage or checked TSB NTB19-075 / NTB17-034?

Is there a rattling noise specifically during a cold startup?

→ Inspect the timing chain for stretch and replace the timing chain tensioner and guides with steel-backed units.

Is the engine consuming excessive oil or emitting blueish exhaust smoke?

Is the PCV valve the original orange-colored unit or is it clogged?

→ Replace the orange PCV valve with the updated black OEM version and perform an ECM reprogram per the Voluntary Service Campaign.

→ Perform a cylinder leak-down test to confirm worn or stuck piston rings requiring engine replacement.

Is the Check Engine Light on with code P0101 (MAF Sensor Performance)?

→ Clean the electronic throttle chamber, inspect the PCV valve, and perform an ECM reprogram per TSB NTB17-039.

Are there EVAP system codes present (P0442, P0455, or P0456)?

→ Inspect and replace the vent control valve O-ring.

Is there a loud knocking/tapping noise or a 'bone dry' dipstick indicating internal mechanical failure?

Is the cost of internal repair (e.g., rod bearings) higher than a used OEM unit ($250-$1,000)?

→ Purchase a used MRA8DE engine (VIN 4th digit 'A') and transfer original emissions components if installing a SULEV unit into a Federal car.

→ Perform internal engine repairs using a precision torque wrench for spark plugs (14 ft-lbs) to avoid cracking the aluminum head.

→ Inspect the accessory drive belt for whistling or check for ignition coil/spark plug misfires.

→ Perform a CVT diagnostic for belt slippage or valve body failure before condemning the engine.