Hi everyone, I own a 2006 Ford Focus 1.6 petrol Zetec 5-door model. A few days ago, the engine warning light came on. I used an OBD2 code reader to clear the fault codes twice, but they returned with four specific trouble codes: P0030, P0037, P0050, and P
Thanks so much Kev2 — you're absolutely right! I visited several garages and even consulted a Bosch technician, but no one mentioned checking fuses. Turns out it was a blown fuse. This insight has been incredibly helpful. Thank you again!
Hi there — the fuse blew again. Why is this happening? Does anyone know what could be causing it? Where should I check for the issue?
The answer lies here: a blown fuse typically indicates an underlying wiring short circuit. This is fundamental automotive knowledge — you must locate and fix the short to prevent repeated fuse failures.
Do not replace any sensor simply because a code appears — OBD2 codes indicate system-level issues. Your codes (P0030, P0037, P0050, P0057) point to oxygen sensor circuit faults, which often stem from wiring problems. Have you checked the fuses for oxygen sensor heaters? Did your vehicle experience exposure to deep water or rough off-road driving? For detailed explanations of these codes, refer to this guide: https://www.obd-codes.com/trouble_codes/ (scroll down to find P0030-P0057). Note: In many regions, 'lambda sensors' are commonly referred to as oxygen sensors.