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2018 Discovery Sport HSE: Persistent 'Restricted Performance' Message and Power Loss

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Brittany E. · rep 0 · May 22, 6:37 AM · 1 replies · solved · Question

Vehicle: 2018 Land Rover Discovery Sport HSE

Hey everyone, I'm pulling my hair out with my 2018 Land Rover Discovery Sport HSE. For the past few weeks, I've been getting the 'Restricted Performance' message popping up on the dash, usually when I'm accelerating onto the highway or going uphill. The car definitely loses power, feels sluggish, and sometimes the check engine light comes on with it.

It usually clears after a restart, but it's happening more frequently now. I've checked the oil level, and it seems fine. No obvious leaks or strange noises. I'm worried about driving it like this, especially since it's my daily driver.

Has anyone else experienced this with their Discovery Sport? What was the cause? I'm trying to figure out if this is something I can look into myself or if it's an immediate trip to the dealership. Any advice on common culprits or things to check would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:37 AM

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This is a very common and concerning issue for Land Rover owners, particularly with the Ingenium engines found in models like your 2018 Discovery Sport HSE. The "Restricted Performance" message indicates that the engine control unit (ECU) has detected a fault that could potentially damage the engine or transmission, or compromise emissions, and is limiting power to protect components.

Here's a breakdown of common causes and steps:

  1. Get a Diagnostic Scan: The absolute first step is to get the vehicle scanned for diagnostic trouble codes (DTCs). Even if the check engine light isn't currently on, a pending or stored code will likely be present. Common OBD-II codes associated with "Restricted Performance" on these models include:

    • P0299: Turbocharger/Supercharger Underboost
    • P00BD: Mass Air Flow (MAF) Sensor Circuit Range/Performance - Air Flow Too High
    • P0101: Mass Air Flow (MAF) Sensor Circuit Range/Performance
    • P0420/P0430: Catalyst System Efficiency Below Threshold (Bank 1/2)
    • P2002: Diesel Particulate Filter (DPF) Efficiency Below Threshold (for diesel models)
    • P2263: Turbocharger/Supercharger Boost System Performance

  2. Common Causes:

    • Turbocharger Issues: Wastegate actuator failure, sticky turbo vanes, or a leaking boost pipe can all lead to underboost conditions.
    • MAF Sensor Failure: A faulty Mass Air Flow sensor can send incorrect air intake readings to the ECU, causing incorrect fuel-air mixtures and triggering restricted performance.
    • EGR System Problems: A clogged or faulty Exhaust Gas Recirculation (EGR) valve can disrupt engine combustion.
    • Vacuum Leaks: Leaks in vacuum lines or intercooler hoses can lead to a loss of boost pressure.
    • Fuel System Issues: Less common, but a failing fuel pump or clogged fuel filter could also contribute.
    • Software Glitches: Sometimes, a simple software update from the dealership can resolve intermittent issues.

  3. When to See a Shop:

    • Immediately: If the "Restricted Performance" message is persistent, the check engine light is solid, or you notice significant loss of power, unusual noises, or smoke. Driving with these symptoms can lead to more severe and costly damage.
    • Dealership vs. Independent: For Land Rover-specific issues, especially those involving complex engine management or turbo systems, a Land Rover dealership or a reputable independent shop specializing in European vehicles with appropriate diagnostic tools is recommended. They can perform specific Land Rover diagnostics and access TSBs (Technical Service Bulletins) that might address known issues for your model year.

Do not ignore this warning, as it's the vehicle's way of telling you there's a serious underlying problem that needs attention.

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