IsItAGoodCar
Reliability Guide

Common Problems with the
2005 Saab 9-5 OG

By 2005 the 9-5 OG was in its final years but remained a superb long-distance cruiser. Most oil-sludge-affected cars had either been repaired or failed, and the surviving examples with full service history represented excellent value. The Aisin-Warner automatic gearbox is robust but needs fluid changes.

What changed for 2005

  • •Final years of production
  • •Most oil-sludge cars had been repaired or failed
  • •Aisin-Warner automatic gearbox robust if serviced
  • •Rear wheel arch rust appearing under plastic trim on estates

Common MOT watch-outs

  • !Oil sludge still possible on neglected examples
  • !ACC blend door failure
  • !Rear trailing arm bush wear at 60k–100k miles
  • !Turbocharger failure if maintenance neglected
4
Known Issues
2
Serious
1
Moderate
1
Minor

All Known Issues

Turbocharger Failure

SeriousEngine

All 9-5 engines use a turbocharger, and lack of maintenance or oil sludge can cause premature turbo bearing failure. A blown turbo can send oil into the intake or exhaust, causing smoke and potential engine damage.

Est. Repair Cost: £800–£2,000
Warning Signs:

White/blue smoke from exhaust, Sudden loss of power, Whistling or siren noise from engine bay, Oil consumption increase

What to Inspect:
  • Listen for turbo whistle on acceleration
  • Check for oil in the intercooler pipework
  • Look for signs of oil burning or smoke
Verified by IsItAGoodCar Research Team

Timing Chain Rattle (4-Cylinder Engines)

SeriousEngine

The timing chains on B205/B235 engines can stretch and rattle, especially on cold start. If the chain tensioner fails, the chain can skip teeth and cause valve-piston contact.

Est. Repair Cost: £500–£1,500
Warning Signs:

Rattling noise on cold start, Engine management light, Poor idle quality

What to Inspect:
  • Listen for a metallic rattle for the first few seconds after cold start
  • Check for oil feed to the chain tensioner
  • Ask about oil change history
Verified by IsItAGoodCar Research Team

Rear Trailing Arm Bushes

ModerateSuspension & Chassis

Worn rear bushes lead to poor tracking and high tyre wear.

Est. Repair Cost: £200–£400
Warning Signs:

"Ghost steering" from the rear, Knocking over speed bumps

What to Inspect:
  • Check rear tyre inner edge wear
Verified by IsItAGoodCar Research Team

ACC Blend Door Failure

MinorInterior & Trim

The plastic arm or shaft for the heater blend door snaps, leaving one side of the car at the wrong temperature.

Est. Repair Cost: £100–£400
Warning Signs:

Fault code 08 or 11 on ACC display, Inconsistent cabin temperature

What to Inspect:
  • Run the ACC calibration (press Auto and Off together)
  • Verify heat/cool on both sides
Verified by IsItAGoodCar Research Team

Buying Tips for 2005 Saab 9-5 OG

  • ✓Prioritise cars with documented sump drops and regular 6k-mile oil changes
  • ✓Check rear wheel arches for rust starting under the plastic trim on estates
  • ✓Automatic gearboxes are robust but need fluid changes every 60,000 miles
2000–20042006–2010
Check a 2005 Saab 9-5 OG by Registration