Aygo Undervoltage Issue

Experiencing undervoltage issues with my 2006 Toyota Aygo diesel, mileage 193890 km. Symptoms include poor starting, system failures, weak lights, and a weak battery during start. Suspect a heavily discharged or defective battery. Any insights?

4 comment(s)

I had similar voltage drop issues with my 2012 Renault Clio. The symptoms you describe are consistent with battery problems. Have you checked the charging system for alternator issues?

Thank you for your reply. Regarding the charging system, what specific aspects should I be evaluating on the Aygo?

With my Clio, I checked the alternator output voltage first. If that's within spec, then a battery load test is the next step. Given the complexity, I'd suggest a workshop visit to rule out any parasitic drain issues.

Understood. Thank you for the advice. The issue was indeed a defective battery. Replacement cost was 290€, problem solved.

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