FAQ
TL;DR: Megane III 1.5 dCi 110 hp reported “Check fuel injection,” “Check the exhaust system,” plus ESP lights; a quick restart didn’t fix it. [Elektroda, bartosz323, post #16982167]
Quick Facts
- Vehicle: Renault Megane III, 1.5 dCi 110 hp with factory DPF. [Elektroda, bartosz323, post #16982167]
- Short-trip usage noted: 4 km commute, cold engine ≤2100 rpm. [Elektroda, bartosz323, post #16987036]
- Stored faults observed at dealer: boost pressure/turbo control, no pinpoint failure. [Elektroda, bartosz323, post #16986523]
- Additive plus sustained expressway drive reduced symptoms for the owner. [Elektroda, bartosz323, post #16986523]
- Longer routes linked to clearing “Check injection/exhaust” messages over time. [Elektroda, bartosz323, post #17812193]
What do “Check injection / Check exhaust / ESP” mean on a Megane III diesel?
In this case, all three lit during a quiet drive, with a brief tug and no lasting fix after restart. The thread later tied the injection/exhaust warnings to DPF loading rather than a hard engine failure. Treat it as a drivability/aftertreatment issue first, then scan for codes. [Elektroda, bartosz323, post #17812193]
Can short trips cause DPF-related warnings on the 1.5 dCi?
Yes. The owner did mostly short, cold drives and later confirmed the DPF link. After switching to longer routes, the warnings stopped. “I started to ride longer routes and since then silence.” This pattern suggests incomplete regenerations during short trips. [Elektroda, bartosz323, post #17812193]
What RPM and trip profile did the affected car have before the warnings?
The driver had a 4 km commute and kept the cold diesel at or below 2100 rpm. This operating pattern limits exhaust temperature and can delay DPF regeneration. Consider adjusting usage to allow periodic hot runs. [Elektroda, bartosz323, post #16987036]
Which fault codes were stored when the dealer checked it?
The dealer reported boost pressure and turbo control faults stored in memory but could not tie them to a specific failed part. They believed everything was otherwise OK. Treat such codes as context while you address DPF loading. [Elektroda, bartosz323, post #16986523]
How can I try a safe, thread-tested clean-up before repairs?
The owner added an injector-cleaner additive and drove the car hard on the expressway. Symptoms subsided afterward. How-To: 1. Fill with quality diesel and add cleaner. 2. Warm the engine fully. 3. Take a sustained expressway drive. [Elektroda, bartosz323, post #16986523]
What scan tool should I use to read Renault-specific errors?
Use Renault CLIP to read manufacturer-specific codes and live data. A member explicitly asked for CLIP error codes early in troubleshooting, highlighting its relevance here. Generic OBD tools may miss Renault-specific flags. [Elektroda, bsv2001, post #16982379]
Why does the engine go “brum brum” when coasting to a stop, especially in cold weather?
The owner described uneven decel noise with normal idle indicated. It lasted a few seconds, worse in lower ambient temperatures, then normalized. That behavior can accompany aftertreatment events or fueling transitions on cold engines. Scan data will confirm. [Elektroda, bartosz323, post #17022308]
I hear a metallic sound around 1800–2200 rpm. Is that normal?
One member reported a persistent metallic tone at ~1800–2200 rpm and saw a “Check injection” message. They had driven four years before noticing escalation. Capture a recording and inspect the drivetrain and turbo area. [Elektroda, intar1, post #17811172]
Could a dual‑mass flywheel (DMF) cause the metallic noise?
Another member answered that the symptom points to the DMF (“dwumasa”). A failing DMF can rattle within a narrow RPM band and under load changes. If noise aligns with clutch engagement, inspect the flywheel. [Elektroda, brani, post #17811276]
Is the ESP warning related to engine faults here?
The ESP light appeared alongside engine and exhaust warnings during the event, then disappeared, leaving only the exhaust indicator. Address the engine side first; transient ESP lights can follow torque‑limp interventions. [Elektroda, bartosz323, post #16982167]
Did longer highway drives really solve the warnings for this owner?
Yes. After connecting the issue to the DPF, the owner began taking longer routes, and the messages stopped appearing. This suggests successful passive or assisted regeneration during those trips. [Elektroda, bartosz323, post #17812193]
What is the DPF on this Megane III?
DPF refers to the diesel particulate filter fitted to the 1.5 dCi 110. The thread links injection/exhaust warnings to DPF loading, not immediate injector failure. It’s part of the exhaust aftertreatment system. [Elektroda, bartosz323, post #16982167]
What does “dwumasa” mean in the thread?
“Dwumasa” is Polish for dual‑mass flywheel (DMF). A respondent suggested DMF as the source of the reported metallic noise. Inspect clutch and flywheel if sounds track clutch use. [Elektroda, brani, post #17811276]
Injector cleaners: helpful or hype in this case?
The owner added a fuel additive marketed to clean injectors, then drove on the expressway. They reported improvement afterward. While not a diagnosis, it coincided with fewer warnings. Document results and re‑scan. [Elektroda, bartosz323, post #16986523]
If boost/turbo control codes appear, what’s the next step?
Don’t replace parts blindly. The dealer saw boost control codes but no clear culprit. Verify boost leaks, actuator function, and DPF load, then road‑test after a hot run. [Elektroda, bartosz323, post #16986523]
