IsItAGoodCar
Reliability Guide

Common Problems with the
1990 Ford Escort Mk5 / Mk6

Launch of the Escort Mk5 in 1990, featuring an all-new aerodynamic body, revised rear suspension, and carryover CVH and HCS petrol powertrains.

What changed for 1990

  • •UK launch of the fifth-generation Escort platform in 3-door, 5-door, and estate layouts
  • •Introduction of new aerodynamic bodywork with flush glazing and reduced drag coefficient
  • •Early reliance on 1.3 HCS and 1.4/1.6 CVH engines before 1992 Zeta 16V engine debut

Common MOT watch-outs

  • !Structural rust along rear chassis legs, sills, and suspension mounting outriggers
  • !Excessive front wishbone rear bush degradation and ball joint play
  • !High exhaust emissions from worn carburettors or tired single-point fuel injection
2
Known Issues
2
Serious
0
Moderate
0
Minor

All Known Issues

Battery Tray Corrosion and Main Fusebox Water Ingress

SeriousElectrics & Electronics

The battery mounting tray in the engine compartment sits directly above the passenger-side bulkhead above the interior Central Electronic Module (main fusebox). Acid spills from aging lead-acid batteries and blocked scuttle drain grommets cause the thin sheet metal of the battery tray and surrounding seam sealer to corrode and perforate. Rainwater washes through the rust hole directly onto the internal multi-layer printed circuit board of the fusebox, causing copper track corrosion, dry solder joints, and chaotic electrical malfunctions across multiple circuits.

Est. Repair Cost: £150–£450
Warning Signs:

Uncommanded windscreen wiper activation, non-functioning heater blower fan, or dead fuel gauge, Engine randomly cuts out or refuses to start due to loss of power to fuel pump relay, Visible dampness, white mineral corrosion, or scorched electrical pins on the fusebox circuit board

What to Inspect:
  • Remove the 12V battery and inspect the steel metal tray underneath with a bright torch for rust holes
  • Look upward under the passenger dashboard at the fusebox for signs of green corrosion or water staining
Verified by IsItAGoodCar Research TeamUpdated

Rear Wheel Arch and Fuel Filler Neck Structural Rust

SeriousBodywork & Rust

The rear inner and outer quarter panels on Mk5 and Mk6 Escorts feature an unsealed cavity surrounding the fuel filler pipe neck. Road spray, mud, and road salt thrown up by the rear offside tyre accumulate in the ledge behind the fuel flap rubber seal. Lacking modern plastic wheel arch liners and robust factory galvanising, the steel panels corrode rapidly from the inside out, bubbling through the exterior paintwork around the fuel cap and spreading into the rear arch lips, inner wheel tub, and rear chassis legs.

Est. Repair Cost: £350–£900
Warning Signs:

Paint bubbling, blistering, and brown rust staining around the circumference of the fuel filler flap, Visible perforation and crunchy crumbly metal along the inner lip of the rear wheel arches, Strong smell of raw petrol or road dirt visible around the fuel neck pipe during refuelling

What to Inspect:
  • Feel inside the rear wheel arches behind the fuel filler neck for accumulated mud and rotten steel
  • Check past MOT history online for dangerous structural corrosion advisories within 30cm of suspension mounts
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 1990 Ford Escort Mk5 / Mk6

  • Inspect the rear arches and inner sills thoroughly for structural corrosion before making an offer
  • Prefer later 1992-1994 Mk5b models which gained structural reinforcement and Zetec 16V engines
1991
Check a 1990 Ford Escort Mk5 / Mk6 by Registration