Understanding OEM Customer-Specific Requirements in IATF 16949

What Customer-Specific Requirements Are and Why They Matter

IATF 16949 is a quality management system standard for automotive production and service parts organisations. Unlike ISO 9001 — which is intended to be applied consistently across all sectors — IATF 16949 explicitly recognises that OEM customers have specific requirements that go beyond the standard's baseline requirements. These customer-specific requirements (CSRs) are documented separately by each OEM and are referenced in the IATF 16949 standard as mandatory for suppliers to that OEM.

Non-compliance with your customer's CSRs is non-compliance with IATF 16949 for that customer relationship — even if your quality management system otherwise fully conforms to the standard. IATF 16949 certification auditors are required to assess CSR compliance during the certification audit. A supplier certified to IATF 16949 but found to be non-compliant with their customer's CSRs is subject to a major non-conformance at the audit.

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Step 01

Identify your applicable OEM CSRs

Determine which OEM customers you supply and download their current CSR documents from the IATF website (iatfglobaloversight.org) or directly from the customer portal. Major OEM CSRs include: Volkswagen Group (VDA-aligned with specific VW additions), Stellantis (formerly FCA/PSA), General Motors, Ford, BMW Group, Mercedes-Benz Group, Toyota, and Hyundai. CSR documents are updated periodically — verify you have the current version.

Step 02

Gap assess your QMS against each CSR

For each applicable CSR, work through the specific requirements and compare them against your current quality management system. Key CSR areas that most frequently generate gaps: APQP process (customer-specific milestones and deliverables), PPAP requirements (customer-specific submission requirements and approval levels), warranty management (customer-specific warranty return process and analysis requirements), and product safety (customer-specific product safety management requirements that go beyond IATF 16949 standard requirements).

Step 03

Integrate CSR requirements into your QMS documentation

Update your procedures, work instructions and forms to incorporate CSR-specific requirements alongside the IATF 16949 baseline requirements. Each CSR should be traceable through your documentation — auditors will ask to see how specific CSR requirements are addressed in your QMS documents. A cross-reference matrix that maps each CSR requirement to the procedure, work instruction or record that addresses it is a practical audit preparation tool.

Step 04

Train your team on CSR requirements

Quality managers, customer-facing engineers, and APQP/PPAP leads must understand the CSR requirements specific to the customers they serve. CSR requirements differ significantly between OEMs — what VW Group requires in a PPAP submission differs from what Stellantis requires. Training on customer-specific requirements is not one-size-fits-all.

CSR Compliance Readiness Checklist

Current CSR documents downloaded for all OEM customers — versions verified on IATF website

Gap assessment completed against each applicable CSR

QMS documentation updated to incorporate CSR-specific requirements — with cross-reference matrix

APQP process includes all customer-specific milestone and deliverable requirements

PPAP process reflects customer-specific submission requirements and approval levels

Quality and engineering personnel trained on CSR requirements for their specific customers

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About AjaCertX

AjaCertX is a specialist compliance, certification and assurance partner serving the automotive supply chain globally. Our Automotive Assurance practice delivers IATF 16949 certification, VDA 6.3 preparation, and CSR compliance programmes for Tier 1 and Tier 2 suppliers.