Diesel Motor Mechanic (ANZSCO 321212) is a separate occupation from the Motor Mechanic (General) trade covered in an earlier Kingsbridge guide. Different code, different benchmark qualification — and, worth flagging up front, a code that’s currently wrong on Kingsbridge’s own service page for this trade. Below: the correct classification, what Trades Recognition Australia (TRA) actually assesses, and which visas a positive assessment opens.
Diesel Motor Mechanic Is ANZSCO 321212, Not 331212
Kingsbridge’s own Diesel Motor Mechanic service page carries the code 331212 in its URL. That code doesn’t belong to this occupation — the Australian and New Zealand Standard Classification of Occupations (ANZSCO) lists Diesel Motor Mechanic at 321212, inside the Automotive and Engineering Trades Workers major group, not 331212. The distinction matters because a visa application, a skills assessment request, or a sponsorship nomination that cites the wrong occupation code can be queried or rejected on that basis alone, independent of whether the applicant’s actual trade skills are sound. Anyone using that page as a reference should quote 321212, not the code in its current URL.
Don’t confuse this trade with Motor Mechanic (General), ANZSCO 321211, covered in an earlier guide, either. The two sit one digit apart and get used interchangeably in everyday conversation, but TRA assesses them against different benchmark qualifications. As set out below, a diesel-specific trade background doesn’t automatically satisfy the general code, and the reverse is just as true.
What Does a Diesel Motor Mechanic Skills Assessment Actually Check?
TRA is the designated assessing authority for Diesel Motor Mechanic, the same body responsible for Motor Mechanic (General) and most other automotive and engineering trades. The benchmark qualification is the Certificate III in Heavy Commercial Vehicle Mechanical Technology (AUR31120), not the Certificate III in Light Vehicle Mechanical Technology that benchmarks the general motor mechanic code. That distinction reflects the actual work: a Diesel Motor Mechanic maintains, diagnoses and repairs the diesel engines and mechanical systems of trucks, buses and other heavy commercial vehicles. Passenger cars aren’t part of the job.
TRA’s own Job Ready Program documentation for this occupation asks a supervising employer to confirm, task by task, that a candidate can diagnose and repair diesel engine faults, carry out scheduled heavy-vehicle servicing, work on fuel and brake systems, and competently handle basic workshop welding, alongside the standards-knowledge and communication skills TRA checks for every trade. A workshop that only services light vehicles, or a candidate whose experience is confined to passenger-car diesel engines, is unlikely to be a clean fit for this specific code. That’s worth checking honestly before lodging — it’s exactly the kind of mismatch that otherwise only surfaces once the assessment is already underway.
Which Visas Can a Diesel Motor Mechanic Skills Assessment Be Used For?
Diesel Motor Mechanic sits on both the Core Skills Occupation List (CSOL) and the Medium and Long-term Strategic Skills List (MLTSSL) — the same dual listing as Motor Mechanic (General). That gives a positive assessment access to the full spread of skilled visa pathways:
- Points-tested, no employer required: Subclass 189 (Skilled Independent), Subclass 190 (Skilled Nominated) and Subclass 491 (Skilled Work Regional)
- Employer-sponsored: Subclass 482 (Skills in Demand, Core Skills stream), Subclass 494 (Skilled Employer Sponsored Regional) and Subclass 186 (Employer Nomination Scheme), which grants permanent residence directly
An employer looking to sponsor a candidate under this occupation should also understand how to find and work with an employer sponsor in Australia alongside the skills assessment step. The two run at the same time, not one after the other.
Automotive and engineering trades aren’t among the nine sectors named in Ministerial Directions 121 and 122 (the skilled-visa processing order that replaced Direction 119 on 19 September 2026) — those tier-one sectors are healthcare, construction, teaching, law enforcement, defence, resources, agriculture, aquaculture and fishing. A Diesel Motor Mechanic application therefore sits in a later processing tier than the construction trades Kingsbridge has covered elsewhere, so applicants shouldn’t expect the same turnaround as a tier-one trade.
How Much Does the Assessment Cost, and How Long Does It Take?
TRA runs two pathways depending on where the applicant currently lives. The Offshore Skills Assessment Program (OSAP), for applicants outside Australia, has two tiers: Pathway 2 (documentary evidence plus a technical interview) costs A$2,020 (A$1,120 plus A$900); Pathway 1, which adds a practical skills test where TRA considers the file needs one, costs up to A$5,320 (A$1,120 plus A$2,000 plus A$2,200). Both are typically processed within 15 weeks of TRA receiving complete evidence.
The Job Ready Program (JRP), for applicants already working in Australia, runs as a structured, employer-verified assessment across the applicant’s employment period and totals A$3,410 (A$490 plus A$2,845 plus A$75) — the same fee structure TRA applies across its trades. Either pathway depends on verifiable, recent heavy-vehicle diesel experience (generally at least 12 months within the last three years), backed by employer references, payslips or tax records and evidence of the actual work performed.
What’s the First Thing to Check Before Lodging?
Before paying either fee, confirm two things. First, that the day-to-day work genuinely matches the Diesel Motor Mechanic benchmark (heavy commercial vehicles) and not the general motor mechanic code’s light-vehicle one. Second, that 321212 is the code quoted on every document in the application, not the 331212 still showing on Kingsbridge’s own service page URL. Getting either one wrong after paying the OSAP or JRP fee is the most avoidable way to lose months on this pathway.
Frequently Asked Questions
What is the correct ANZSCO code for Diesel Motor Mechanic?
321212. It is sometimes shown incorrectly as 331212, including on Kingsbridge’s own service page for this trade — 321212 is the code that should be used on any visa or skills assessment document.
Is Diesel Motor Mechanic the same occupation as Motor Mechanic (General)?
No. Diesel Motor Mechanic (321212) and Motor Mechanic, General (321211) are separate ANZSCO codes assessed by TRA against different benchmark qualifications — Certificate III in Heavy Commercial Vehicle Mechanical Technology (AUR31120) for Diesel Motor Mechanic, versus the light-vehicle equivalent for the general code.
Which visas does a Diesel Motor Mechanic skills assessment support?
Because the occupation sits on both the CSOL and the MLTSSL, a positive assessment supports the points-tested Subclass 189, 190 and 491 visas, and the employer-sponsored Subclass 482, 494 and 186 visas.
How much does the Diesel Motor Mechanic skills assessment cost?
Offshore applicants pay A$2,020 (Pathway 2) or up to A$5,320 (Pathway 1, with a practical test) under TRA’s Offshore Skills Assessment Program. Onshore applicants pay A$3,410 total under the Job Ready Program.
Is this occupation given priority visa processing?
No. Diesel Motor Mechanic isn’t among the nine priority sectors under Ministerial Directions 121 and 122 (healthcare, construction, teaching, law enforcement, defence, resources, agriculture, aquaculture and fishing), so it sits in a later processing tier than those occupations.
Key Takeaways
- Diesel Motor Mechanic is ANZSCO 321212 — not 331212, the code currently shown on Kingsbridge’s own service page for this trade.
- It is a separate occupation from Motor Mechanic (General, 321211), assessed by TRA against the Certificate III in Heavy Commercial Vehicle Mechanical Technology (AUR31120) rather than a light-vehicle qualification.
- Dual CSOL and MLTSSL listing opens six visa subclasses: 189, 190, 491, 482, 494 and 186.
- OSAP (offshore) costs A$2,020 to A$5,320; JRP (onshore) costs A$3,410.
- This trade isn’t in a Direction 121/122 priority sector, so realistic processing-time expectations should be set accordingly.
Ready to find out if you qualify?
Kingsbridge Australia offers a free 15-minute pre-assessment with Dexter Lee, our Registered Migration Agent (MARN 2518927), to see if you qualify for this pathway. Book a time below.
