Car Model Guide/ Issues/ Oil-pump balance-shaft drive failure

Oil-pump balance-shaft drive failure

Attaches to CBAB at engine level · Engine · carried by 11 variants across 11 chassis

Overview

Oil-pump balance-shaft drive failure is a occasional fault recorded against CBAB at engine level, typically from 100–200k km. It shows up as a sudden oil-pressure warning followed quickly by engine seizure, usually with little or no prior warning. Where it's documented, the repair runs €700–€3,000 (€700–1,300 preventive module; a replacement engine if it has seized, costs dated 2026-07), and it can be difficult to check before you buy. 11 variants across 11 chassis in this database inherit it.

€700 – €3,000

€700–1,300 preventive module; a replacement engine if it has seized · costs dated 2026-07

Likelihoodoccasional

Typical onset100–200k km

Detectableno

Walk awayyes, without proof

Evidencedocumented

What happens

Symptom. A sudden oil-pressure warning followed quickly by engine seizure, usually with little or no prior warning.

Cause. The hex coupling that drives the oil pump off the balance-shaft module can round off, stopping oil delivery. The undersized early hex is the weak point; an updated module addressed it.

Later parts. Updated oil-pump module with a larger hex drive

How to check it

Paperwork

You can't see it on a viewing, this is a paperwork check. Look for the updated oil-pump module in the history, or a specialist who has inspected it; treat an undocumented high-miler as carrying the risk.

On these cars the folder is most of the value.

EngineoccasionalNot detectable at viewingwalk away without proofevidence: documented100–200k km

Every variant that carries this

Variant	Chassis	Body	Years	Risk	Good buy	Cost as % of good buy
2.0 TDI CBAB	8P	hatchback	2008–2013	R4	€4,700	39%
2.0 TDI CBAB	8PA	hatchback	2008–2013	R4	€4,800	39%
2.0 TDI CBAB	8P7	convertible	2008–2013	R4	€4,950	37%
2.0 TDI CBAB	1Z	hatchback	2008–2013	R4	€2,450	76%
2.0 TDI CBAB	1Z Combi	wagon	2008–2013	R4	€2,600	71%
2.0 TDI CBAB	B6	sedan	2008–2010	R4	€2,500	74%
2.0 TDI CBAB	B6 Variant	wagon	2008–2010	R4	€2,650	70%
2.0 TDI CBAB	3T	hatchback	2008–2015	R4	€3,550	52%
2.0 TDI CBAB	3T Combi	wagon	2009–2015	R4	€3,800	49%
2.0 TDI CBAB	5N	SUV	2007–2011	R3	€7,250	26%
2.0 TDI CBAB	5L	SUV	2009–2017	R3	€7,150	26%

The last column is the point. The same repair is an inconvenience on one variant and a reason to scrap the car on another. A failure costing a quarter of the vehicle's value changes the purchase decision regardless of how rare it is.