FAQ
TL;DR: If your Scenic II 2.0 loses injector power and the under‑hood fuse plate shows a melted resistor/white relay, replace the UPC/BSI module. Used units run PLN 200–300; they’re "not enormously expensive things." [Elektroda, Piasek80, post #16854392]
Why it matters: This FAQ helps Scenic II owners decide repair vs. replace, match part numbers, and trace post‑shutdown burning smells.
Quick Facts
- Typical fix: swap the under‑hood UPC/BSI module; matching numbers restores starting and lighting. [Elektroda, sulof1601, post #16854474]
- Cost range: used UPC/BSI modules ~PLN 200–300; many come from donor cars. [Elektroda, Piasek80, post #16854392]
- Lifespan note: donors often have ~10 years in prior service; inspect pins for corrosion. [Elektroda, Piasek80, post #16854392]
- Part selection: choose by identical part numbers for plug‑and‑play results. [Elektroda, sulof1601, post #16854535]
- Safety clue: if insulation were melting, it would vanish within seconds; check non‑electrical heat sources. [Elektroda, sulof1601, post #16873392]
What is the UPC/BSI module on a Scenic II?
It’s the under‑hood power distribution and control box that feeds relays and fuses for engine and lighting. The referenced unit is sold as “Moduł UPC/BSI Scenic II/Megane II 8200306033,” indicating its role as the car’s front power hub. [Elektroda, Piasek80, post #16854392]
My fuse plate shows a melted resistor and white relay—what does that indicate?
It indicates a failed UPC/BSI module. Users reported degraded boards causing starting and lighting faults. Replacement resolved the issues immediately. Severe board damage warrants replacement rather than repair due to reliability and safety concerns. [Elektroda, sulof1601, post #16854474]
How do I fix no fuel reaching the injectors on gas?
Replace the damaged UPC/BSI module with a good unit. One owner’s car stopped firing and exhibited lighting faults; swapping the module made the problems disappear. "Throw it in the trash and buy another one." [Elektroda, sulof1601, post #16854474]
Should I repair the board or buy another UPC/BSI?
Buy another unit. Pins loosen with age, and repairs may not last. A replacement offers a faster, more reliable fix and avoids intermittent faults. Costs are modest for used parts. [Elektroda, Piasek80, post #16854392]
How much should I pay for a replacement UPC/BSI?
Expect around PLN 200–300 for a used module. Many available units are pulled from donor vehicles and work fine if pins are intact. [Elektroda, Piasek80, post #16854392]
Do I need coding after replacing the UPC/BSI?
Not if you match the part numbers exactly. A user swapped in a unit with the same numbers and reported that everything worked fine without extra configuration. [Elektroda, sulof1601, post #16854535]
Which numbers must match on the replacement part?
Match the full part number string printed on the module label. Owners who selected “numbers by numbers” achieved plug‑and‑play results and normal operation. [Elektroda, sulof1601, post #16854535]
Is a donor unit from another car acceptable?
Yes. Donor parts often come from cars with approximately 10 years of prior use. Inspect connectors and pins, then install if the numbers match. [Elektroda, Piasek80, post #16854392]
I still smell burnt plastic after shutdown—what should I check first?
Check for non‑electrical heat sources. A minor oil leak onto the manifold or a dragging brake can create a lingering burnt smell after stopping, even with perfect electrics. [Elektroda, sulof1601, post #16871784]
Could the smell still be electrical if it only appears after turning the car off?
Unlikely. If a cable were melting, the insulation would vanish within seconds and other symptoms would show, like battery drain. Investigate heat sources instead. [Elektroda, sulof1601, post #16873392]
Where is the smell strongest on this issue?
One report localized the smell near the driver’s side, around the left wheel arch and below the steering column, especially right after shutdown. [Elektroda, IgorEs2, post #16873344]
Can a bad UPC/BSI cause both lighting issues and hard starting?
Yes. A degraded module led to lighting malfunctions and starting problems. Replacing it cleared both faults immediately for the reporting owner. [Elektroda, sulof1601, post #16854474]
How-to: replace the Scenic II UPC/BSI safely
- Disconnect the battery and remove the under‑hood fuse box assembly.
- Install a replacement UPC/BSI that matches the exact part numbers.
- Reconnect, then test starting and exterior lights before driving. [Elektroda, Piasek80, post #16854392]
What if everything works fine but the smell persists—can I keep driving?
If the car behaves correctly and the battery holds charge, focus on mechanical heat sources first. Electrical faults would escalate rapidly with visible damage. [Elektroda, sulof1601, post #16873392]
Why not attempt a board-level repair on the melted fuse plate?
The board was in terrible condition in the reported case. Repair would be unreliable. Replacement removed the issues immediately and restored function. [Elektroda, sulof1601, post #16854474]
