Audi TT RS Plus
The CEPB is the sharpened Plus version of the CEPA with 360 PS instead of 340 — same cast-iron block, larger turbo, more aggressive mapping. The TT RS Plus 8J was the last model with the heavy cast-iron five-cylinder before the switch to the aluminium DAZA. Acoustically near-identical to the CEPA: the same 1-2-4-5-3 five-cylinder rhythm that transitions into the characteristic five-cylinder howl above 4,000 rpm. The extra 20 PS are less noticeable in everyday use than on paper — the larger turbo delivers slightly more pull in the upper rev range. All known CEPA weaknesses apply identically: HPFP, PCV, water pump.
360 hp, Plus variant — sharper and rarer
The Plus variant of the 8J TT RS: 20 more hp through optimised turbo mapping, subtly visually differentiated. Barely noticeable on the road, measurable on a dyno. The real significance: rarity and collector value. The CEPB in the TT RS Plus is already rare — anyone who finds an unmolested example has a piece of five-cylinder history.
Engine Weaknesses 16
Fire land or ring land of the piston breaks, typically at cylinder 1. Cause: insufficient ring land width, thermal overload. Audi changed the piston supplier after 09/2011. Affects early production.
Symptoms: Sudden power loss, engine warning light and EPC illuminate, misfire cylinder 1, zero compression on affected cylinder, rough idle.
Intake manifold tumble flap screw comes loose and is sucked into cylinder 5. Immediate compression loss, piston and cylinder head damage. Affects production years 2009–2012.
Symptoms: Extremely rough running, sudden power loss without warning. Engine runs on 4 cylinders. Engine warning light.
Plastic water pump housing cracks from thermal cycling. Coolant escapes on the driver's side. Known issue with TPI documentation.
Symptoms: Coolant puddle on driver's side after shutdown, dropping coolant level, coolant smell after driving.
Bearing damage from insufficient oil supply (short trips, cold start under load). Secondary damage: piston melt from exhaust back-pressure, intercooler contamination with oil mist.
Symptoms: Whistling noise under higher load, black smoke, heavy oil consumption, engine throttling (limp mode).
High-pressure pump sits on the cam cover. If the seal fails, fuel enters the engine oil — oil level rises, lubrication effectiveness drops, bearing damage risk.
Symptoms: Strong petrol smell at the oil filler cap, rising oil level on dipstick despite no top-up, fuel smell in the cabin.
DQ500 mechatronic unit is the most common failure point. Stock clutch slips above ~650 Nm. Gearbox oil change from 60,000 km recommended. Early DQ500 had failure-prone three-piece synchroniser rings.
Symptoms: Jerkiness on pull-away or gear change 2→3, banging under brisk acceleration, clutch slip when cold. In extreme cases complete gearbox failure.
CEPA uses a demand-controlled oil pump that delivers insufficient pressure on cold start. Chain tensioner gets too little oil; chain rattles at 2000–2700 rpm. Software update SVM 01A098 mitigates the issue.
Symptoms: Rattling on cold start at 2000–2700 rpm, disappears after 10–50 seconds. With prolonged wear also camshaft phaser faults.
Direct injection only, no port injection: oil vapour from crankcase ventilation bakes onto valve faces. Visible from 50,000 km. DAZA/DNWA/DNWC with dual injection not affected.
Symptoms: Rough idle, slight power loss on cold start, slightly elevated consumption. Only visible via borescope.
PCV outlet sits next to the diverter valve. When open, oil mist is drawn in and condenses in the air filter housing. Accelerates intake valve coking on CEPA/CZGB.
Symptoms: Oil residue in air filter housing and on the air filter, occasional oil mist from intake tract at full load.
Solenoid valve between large and small coolant circuit sticks slightly open — engine temperature fluctuates between 70–90°C. No fault code as the valve is electrically intact.
Symptoms: Engine temperature does not stabilise at 90°C, fluctuates, long warm-up even in summer. No fault code.
2013 recall of all RS3 (from 2011) and TTRS (from 2010): brake pads squealed, wet brakes showed delay, high wear. New brake callipers and pads plus software update free of charge.
Symptoms: Squealing below 20 km/h, brief brake response delay when wet, unusually high brake pad wear.
Flange gasket on the oil filter housing (integrated oil-water heat exchanger) ages and starts leaking. Coolant visibly drips from the underside of the engine. Gasket 07K115441 (~€30), labour intensive.
Symptoms: Continuously dropping coolant level, wet spots on underbody protection, coolant drops after shutdown.
PCV membrane in the cam cover wears and allows oil mist to enter the intake tract uncontrolled. Promotes carbon buildup and turbocharger bearing damage. Repair kit 07K198469 available.
Symptoms: Blue smoke on cold start (approx. 1 minute), oil in intake pipes and turbo lines, rough idle, whistling noises.
Mechanical vacuum pump 07K145100D wears out early. Leaky plastic connector causes oil drips. If it fails completely, metal swarf enters the engine oil.
Symptoms: Oil drips under the engine, slight oil smell. In total failure: rattling with graphite plate abrasion.
Spark plugs on the 5-cylinder should be changed every 20,000–30,000 km (not Longlife!). Wrong plugs lead to ignition coil defects. Connector plastic breaks if pulled off carelessly.
Symptoms: Misfires at low temperatures, rough idle, slight power loss, P0300–P0305 fault codes.
Transmission mount 8P0199555A is undersized for the engine output. Multiple replacements required. Audi covered material costs as goodwill. Powerflex kit as a permanent solution.
Symptoms: Creaking and cracking noises at low speed over bumps and during load changes in corners.
Vehicle Weaknesses 4
The steering rack is prone to leaks at the rack and produces clicking and creaking noises during slow steering inputs. Often bearing-related; replacement costs €600–1,200.
The 6-speed S tronic exhibits faulty shift software with harsh downshifts in S mode and premature clutch wear during spirited driving. A software update usually resolves the shift issues.
Front strut top mounts wear prematurely and produce typical knocking and clicking when driving over bumps and during steering input. Replacing both sides costs €300–700; MOT-relevant.
Electric window regulators fail through corrosion of the cable guides or motor wear. Documented in TT forums as the most common electrical fault on the 8J.