Tesla Battery Repair – Affordable, Safe and Sustainable | EV Fenix ​​AS Oslo, Honefoss, Jevnake

Is your Tesla battery weak, showing error codes or refusing to charge? At EV Fenix ​​AS, we offer professional repair of Tesla high-voltage batteries – a safe, sustainable and cost-effective solution compared to expensive replacement. We help customers in Oslo, Hønefoss and Jevnaker, as well as other areas in Norway, and deliver fast and reliable service on all Tesla models: Model S, Model 3, Model X and Model Y.

🛡️ Warranty included

📡 Free remote diagnostics

💰 The most competitive prices

♻️ Environmentally friendly repairs

We are an approved car repair shop by the Norwegian Public Roads Administration for the repair of high-voltage batteries.

Why choose EV Fenix?

🔋 Experts for Tesla high-voltage batteries

Many years of experience repairing Tesla battery packs, modules and BMS systems.

⚡ Advanced diagnostics

🧼 Corrosion cleaning and anti-rust protection

🧼 Korrosjonsrens og antirustbeskyttelse

Each repaired battery comes with full cleaning, anti-rust treatment and painting to ensure long life.

🛡️ Warranty on all repairs

You get peace of mind and security with a guarantee on the work performed.

♻️ Sustainability and circular economy

By repairing and reusing components, we extend the life of your battery and reduce the environmental impact.

We diagnose and repair the most common HV battery faults on Tesla – quickly, safely and sustainably.

Free remote diagnosis before deciding on repair.

  • ⚠️ "Service required / Vehicle may not restart"

    Often sensor or isolation failure in the battery. The car may stall and refuse to start after the next on/off.

    🔋 "Maximum battery charge reduced / OK to drive"

    BMS limits charging and capacity due to SOC/voltage imbalance between modules.

    🐢 "Acceleration and top speed reduced (emergency operation/limp mode)"

    The car goes into protection mode in the event of serious deviations (isolation, temperature or voltage errors).

    📉 Module/Cell Imbalance (BrickV / SOC Imbalance)

    One module or cell group deviates → results in reduced range or charging stops.

    🧰 Isolation warning / Isolation breakdown

    Potential leakage to chassis (moisture, contamination or damaged cable).

    🔌 Voltage sensor / wiring harness / BMB connector failure

    Deviations from the Cell Voltage Sensor or VSH connector in the BMB can cause error codes and starting problems.

What we do:

  • 📡 Free remote diagnosis – we confirm whether the error is battery-related
  • 🔎 Safe troubleshooting: insulation measurement, package/module test, BMS/BMB check
  • 🛠️ Repair: module/cell balancing or replacement, sensor/cable repair, contactors, sealing and pressure testing
  • 🧼 Full corrosion cleaning and protection – performed on every repaired battery: thorough cleaning, anti-rust treatment and painting
  • ✅ Calibration & test drive – warranty on work performed

Technical overview (for those particularly interested)

Many Tesla owners search for these error codes when they get notifications in their car – we fix all of these issues.

  • BMS_f107 / BMS_w107 – Voltage sensor (Cell Voltage Sensor)
    Symptom: "Service required / Vehicle may not restart"
    Reasons: Deviations in voltage sensor/BMB, wiring, moisture or corrosion.
    Measures: Sjekk sensorlinjer, reparasjon/bytte av BMB, rengjøring av kontakter, modultest/balansering.
  • BMS_f123 / BMS_w123 – Internal isolation
    Symptom: «Service er påkrevd».
    Reasons: Reduced HV isolation in the package (moisture, damage or contamination).
    Measures: Isolation testing, leak detection, repair, resealing and pressure testing.
  • BMS_u008 – Emergency operation (limp mode)
    Symptom: Acceleration and top speed reduced.
    Reasons: Protection response in case of serious deviation (insulation, voltage, temperature)
    Measures: Full BMS diagnosis, root cause rectification, verification of normal operation.
  • BMS_u018 / BMS_u029 – SOC imbalance / ΔSOC limitation
    Symptom: "Maximum battery charge reduced / OK to drive"
    Reasons: Module/cell imbalance or capacity drift.
    Measures: Module-wise analysis, active balancing or switching, capacity calibration.
  • Module/Cell Imbalance (BrickV / SOC Imbalance)
    Symptom: Charging stops early, reduced range.
    Measures: Measurement of ΔV/SOC per module, balancing or replacing modules, checking BMB.
  • BMS_w142 / BMS_w158 – Isolation warning / Isolation breakdown
    Symptom: Low isolation warning, driving may be limited.
    Measures: Megger/IR test, identify moisture or damage, repair and resealing.
  • BMS_w129 – VSH connector (BMB_VSH)
    Symptom: "Service required / Vehicle may not restart"
    Reasons: Fault in VSH connector or wiring.
    Measures: Cleaning/repair/replacement of connector or harness, test of sensor chain.
  • BMS_w090 – Gateway message delay
    Symptom: Intermittent alerts or errors.
    Measures: Check 12V supply, grounding, CAN bus and gateway/BMS communication.

⚠️ HIGH VOLTAGE WARNING

Tesla battery packs contain high voltage (up to 400–800V).
Accidental contact can result in serious injury or death.
All service and repairs should only be carried out by an approved car repair shop.
with certified personnel and proper protective equipment.

 


✅ We support the right to repair – you don't always have to replace the entire battery.
At EV Fenix ​​AS, we offer sustainable and cost-effective solutions.


Tesla® is a registered trademark of Tesla Inc. EV Fenix ​​AS is a
independent company and has no affiliation with or authorization from Tesla Inc.
Error codes and messages mentioned here are customer-displayed warnings and technical facts used
for purposes related to repair and maintenance.
According to current Right to Repair legislation (EU 2018/858)
independent repair shops and car owners have the right to access necessary
diagnostic and repair information.

Why Choose EV Fenix ​​AS for Battery Repair?

  • 💰 Save thousands of kroner – repair rather than replacement is far less expensive.

  • 🛡️ Guarantee on work performed – you get security and predictability.

  • 🔋 Expertise in Tesla high-voltage batteries – all Tesla models (S, 3, X, Y).

  • 📍 Local service in Oslo, Hønefoss and Jevnaker - as well as customers throughout Norway.

  • ♻️ Sustainable solution – we extend the life of your existing battery.

How It Works

  1. 📞 Contact us via phone, email or contact form.

  2. 📡 We perform free remote diagnostics (log/error message).

  3. 🚗 You deliver the car or we collect it with transport.

  4. 🔧 We repair your battery after thorough troubleshooting.

  5. ✅ The car is tested and returned with a warranty on work.

Coverage areas

  • 📍 Oslo – We collaborate with transport partners who can transport your car safely to our workshop at a good price.

  • 📍 Hønefoss – Local service in the region.

  • 📍 Jevnaker – Our approved workshop is located here.

  • 🚚 Other areas in Norway – We offer service to customers nationwide through transport partners

Contact Us Today

🔹Phone: +4740298088

🔹E-Mail: fenix@fenixas.no

🔹 Adress: Kirkegata 2, 3520 Jevnaker

🔹 Or use our contact form

⚡ Get your car back on the road – without paying for a whole new battery.