Ford Escape: 1.5 EcoBoost Coolant Ingestion into Combustion Chamber

A crack develops in the cylinder head or head gasket of the 1.5L EcoBoost three-cylinder engine, allowing coolant to enter the combustion chamber. This is particularly pronounced under sustained highway driving where thermal cycling stresses the aluminium head. NHTSA opened investigation PE20-009 specifically targeting the 2020 model year after hundreds of complaints. The failure mode can progress rapidly to hydrolocking and catastrophic engine destruction if driving continues after early symptoms appear.

• White or sweet-smelling smoke from exhaust, especially after the engine reaches operating temperature
• Coolant level dropping with no visible external leak under the bonnet or beneath the car
• Rough running or misfire on one cylinder (P0301/P0302/P0303 codes) accompanied by coolant loss
• Engine hesitation or stalling on long highway stretches at constant throttle
• Milky white emulsion visible on the oil filler cap or dipstick

1. 1

   Inspect the coolant reservoir for oil contamination or unusual browning.

2. 2

   Check for white smoke from the exhaust under sustained idle.

3. 3

   Pull spark plugs and look for coolant residue or white deposits on the electrode of cylinder 2 or 3.

4. 4

   Verify coolant level has not dropped without an obvious external leak.

5. 5

   Remove the oil filler cap with engine cold and check for white emulsion (mayonnaise) on the cap and filler neck.

Parts involved: Cylinder head, Head gasket.

$3,500 to $9,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the coolant level ever dropped without an obvious external leak, or has white smoke appeared from the exhaust?”
• “Has the vehicle ever been driven long distances on the motorway and then developed a misfire or rough idle afterwards?”
• “Is there any history of head gasket work, cylinder head replacement, or engine replacement?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.