ABS and ESP warning lights on the Peugeot 307 are common and are safety-critical because they indicate anti-lock braking or traction/stability systems may be compromised.

Symptoms

• ABS and/or ESP lamp stays lit
• Longer braking distances
• Stability or traction disabled

Main causes

• Faulty wheel speed sensor
• Faulty ABS hydraulic module
• Corroded/damaged wiring
• Low battery voltage

Solutions

• Scan ABS/ESP system for codes
• Replace faulty sensors/wiring
• Repair/replace ABS module
• Check battery/alternator

Advice

If ABS/ESP lights are on, drive carefully and avoid aggressive braking/skidding. Prioritize repair before winter or wet seasons.