4033174H HX35W turbo for LF / ISBe6 6.7: symptoms, fault codes and OEM cross references.
HX35W turbo group for DAF LF with Cummins ISBe6 6.7L engines. The repeated reports focus on bearing and seal failure, oil in charge pipes and underboost on motorway grades.
What drivers and mechanics usually notice.
These are practical, workshop-style symptom phrases written for search and support conversations. They are not a substitute for live diagnostic data.
Black smoke under throttle from underboost
Loss of power on motorway grades
Whistling or screaming noise that builds with revs
Oil-soaked intercooler hoses and blue smoke
Turbo shaft endplay excessive on inspection
Intermittent underboost after long climbs
Why 4033174H usually fails
- Wastegate sticking from carbon build-up around the exhaust housing.
- Journal bearing wear and shaft endplay at high mileage.
- Oil seal failure pulls oil into the intercooler and charge hoses.
- Overspeed from boost leaks or sticky wastegate capsule.
Before replacing the part
- Check intercooler and boost pipe oil before and after turbo repair to avoid repeat smoke complaints.
- Inspect wastegate capsule and boost leaks if both P0234 and P0299 appear at different times.
P-codes reported with 4033174H.
| Code | Lookup hint | Related symptom area |
|---|---|---|
| P0299 | Underboost or boost pressure lower than commanded | Black smoke under throttle from underboost |
| P0234 | Overboost condition or stuck wastegate / control problem | Black smoke under throttle from underboost |
| P0045 | Turbo / VGT control circuit open or inactive | Black smoke under throttle from underboost |
All numbers grouped under the canonical 4033174H page.
Keeping every duplicate and replacement number visible on the same canonical page helps exact OEM searches without creating hundreds of duplicated pages.
Truck, engine and year ranges from the reports.
| Truck model | Engine | Years | HP |
|---|---|---|---|
| LF 55 | Cummins ISBe6 6.7L Euro 4/5 | 2005-2013 | 220-300 |
| LF 45 | Cummins ISBe 6.7L Euro 4/5 | 2006-2013 | 180-250 |
Fitment is structured from user-provided reports and must be verified by VIN, installed connector and physical part markings before supply.
Questions about 4033174H.
What are common failure symptoms for 4033174H?
Common symptoms include Black smoke under throttle from underboost; Loss of power on motorway grades; Whistling or screaming noise that builds with revs; Oil-soaked intercooler hoses and blue smoke. Exact symptoms vary by truck, software level and related faults.
Which fault codes are linked with 4033174H?
Reported fault codes include P0299, P0234, P0045.
Can I order by OEM number 4033174H only?
Use the OEM number as a starting point, then confirm by VIN, engine type, installed connector and part photos because some reports contain duplicate or conflicting OEM references.
More turbocharger lookups
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Loss of power uphill or under trailer load · Limp mode after sustained hot operation
HE400VG turbo, later MX Euro 6
Loss of boost above 1200 rpm · Slow boost build after a gear change
HE500VG turbo, MX-13 Euro 6
Significant power loss above 1100 rpm · Dead pedal feel off the line with poor boost build
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