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Vehicle repairs for your 2003 BMW 525i

The ECU Pro offers affordable mail-in automotive repairs for a 2003 BMW 525i. Typical repairs include ECU, DME, Keys, and immobilizer systems such as CAS, EWS, and FEM units. Our services are typically 50-70% cheaper than OEM repairs and come with a warranty and free technical support. Contact us today to get your electronic systems repaired on your 2003 BMW 525i.

Please take note: Your specified vehicle has more than one possible ECU depending on which point in the year it was manufactured. If you are unsure which ECU you have, please contact us with your VIN number.
2003 BMW 525i MS43 ecu mail in repair service. Get a professional MS43 ecu replacement at a fraction of the OEM price. Fast and easy ecu repairs.

For MS43 EWS ECU

ECU Service for 2003 BMW 525i

  • DME / EWS Related codes
  • Engine temp gauge in red
  • No ECU function or communication with the ECU
  • DME RAM self-test checksum errors
  • Electronic throttle controller errors
$159.00 — $599.00
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2003 BMW 525i MS45 ecu mail in repair service. Get a professional MS45 ecu replacement at a fraction of the OEM price. Fast and easy ecu repairs.

For MS45 CAS ECU

ECU Service for 2003 BMW 525i

  • Engine temp gauge in red
  • No ECU function or communication with the ECU
  • Water damage
  • DME RAM self-test: checksum errors
$159.00 — $599.00
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The ECU Pro offers professional 2003 BMW 525i key replacement service. It can be used for all keys lost situations or to make one replacement key. Our 2003 BMW 525i key replacement services are mail-in repairs and 100% plug-and-play.

For Diamond Shape Key

Key Service for 2003 BMW 525i

  • All keys lost replacements
  • Replacement key
  • Vehicle not accepting the key
$49.00 — $350.00
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The ECU Pro offers professional 2003 BMW 525i Electronic Immobilizer (EWS) testing, repairs, and replacement services. All our 2003 BMW 525i EWS repair services are mail-in repairs and 100% plug-and-play. Once installed in your vehicle, no other coding will be required.

EWS Service for 2003 BMW 525i

  • No vehicle crank
  • Vehicle not accepting the key
  • Vehicle starts and stalls
  • EWS Related codes
$159.00 — $499.00
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The ECU Pro offers professional 2003 BMW 525i car access system (CAS) testing, repairs, and replacement services. All our 2003 BMW 525i CAS repair services are mail-in repairs and 100% plug-and-play. Once installed in your vehicle, no other coding will be required.

CAS Service for 2003 BMW 525i

  • No vehicle crank
  • Vehicle not accepting the key
  • Vehicle starts and stalls
  • Yellow ELV steering lock on the dash
$159.00 — $650.00
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