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Coolant leak on my 2018 Discovery Sport HSE - P0128 code?

0

Laura J. · rep 0 · May 22, 6:35 AM · 1 replies · solved · Question

Hey everyone,

I've been noticing a strange smell lately, kind of sweet, and my coolant reservoir has been dropping pretty consistently. I topped it off last week, and it's already low again. I also saw a small greenish puddle under the front passenger side of my 2018 Land Rover Discovery Sport HSE this morning.

To make things more interesting, my engine temperature gauge seems to fluctuate a bit more than usual, and I even got a 'Check Engine' light. I used a basic OBD scanner and it pulled a P0128 code, which I think is related to the thermostat.

Has anyone else experienced this with their Discovery Sport? What are the common leak points I should be checking myself before I take it to a shop? Any DIY tips for diagnosing this would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:35 AM

0

ClearTheCode guidance (Land Rover · Maintenance & DIY)

Summary: For Coolant leak on my 2018 Discovery Sport HSE - P0128 code?, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone,

I've been noticing a strange smell lately, kind of sweet, and my coolant reservoir has been dropping pretty consistently. I topped it off last week, and it's already low again. I also saw a small greenish puddle under the front passenger side of my 2018 Land Rover Discovery Sport HSE this morning.

To make things more interesting, my engine temperature gauge seems to fluctuate a bit…

This is educational guidance, not a substitute for hands-on diagnosis.

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