1.4 and 1.6 TU3/TU5 engine: faults and reliability

• TU3 1.4 75 hp 8v (TU3JP/TU3KFX, 1994-2014)

  1994–2014 · 75 hp · TU3JP, TU3KFX

  Buy

  It is the simplest version, with the least electronics in the whole family: with no turbo or direct injection, its most cited faults according to owners (coil, sensors) are cheap to repair and do not compromise the engine if dealt with in time.^[2][3]

• TU5 1.6 88-90 hp 8v (TU5JP, from 1994)

  1994–2005 · 88–90 hp · TU5JP

  Buy

  It shares the mechanical simplicity of the 1.4: no turbo or complex electronics, with the advantage of a little more power and torque for getting around town and on the road with ease.^[6][7]

• TU5 1.6 16v 109-112 hp (TU5JP4/TU5NFU, from 2000)

  1999–2010 · 109–112 hp · TU5JP4, TU5NFU

  Buy

  It is the most powerful version in the family and the one that appears most in head gasket and coil faults in the report compilations consulted, but these are still cheap repairs compared with a turbo or diesel engine of the same era.^[2][3][4]

Buy: No known serious faults, or they have already been corrected, in this version. With caution: Worth buying if something specific is verified: history, a replaced part or a completed campaign. Avoid: High risk of a serious fault that is hard to check for or prevent.

1. 1High severityFrequency: OccasionalCylinder head and blockHead gasket damaged after overheatingThe head gasket fails mainly as a consequence of previous overheating -from a coolant leak or a faulty thermostat- and not as a factory defect: it appears in a minority of engines, almost always between 30,000 and 180,000 km, with coolant loss, emulsified oil or white smoke.Appears at around 30,000 km
2. 2Medium severityFrequency: CommonIgnitionIgnition coils that fail and cause jerkingThe ignition module -a rail with two twin coils, no distributor- is the electrical fault owners cite most across all models with this engine: it usually fails between 40,000 and 150,000 km and causes jerking, an unstable idle or the engine warning light coming on.Appears at around 40,000 km
3. 3Medium severityFrequency: OccasionalCoolingThermostat stuck open or closedThe thermostat -the controlled "calorstat" on the more recent versions- can stick: if it closes, the engine overheats; if it stays open, it is slow to reach temperature and uses more fuel. It is one of the cooling faults owners of these engines cite most.
4. 4Low severityFrequency: CommonElectronicsSensors that fail: lambda sensor and temperature sensorThe lambda sensor and the coolant temperature sensor are, along with the coils, the components most cited as faulty: they cause an unstable idle, the engine warning light coming on or a cooling fan that does not behave normally.Appears at around 25,000 km
5. 5Low severityFrequency: CommonLubricationOil leak from the rocker cover gasketThe rocker cover gasket dries out with the years and lets oil seep into the spark plug wells: besides the oil stain on the engine, it can soak the spark plugs or the ignition module and cause misfires.Appears at around 120,000 km

Severity colours: low, medium, high, critical. How we rate them

Manufacturer

PSA (Peugeot Citroën)

Family

TU

Fuel

Petrol

Displacement

—

Cylinders

4

Fuel system

Naturally aspirated

Injection

Indirect injection

Timing

Timing belt (dry)

Power

75–112 hp

Peak torque

147 Nm

Production

1994–2014

Makes

Peugeot and Citroën

Technical data^[1][5][6]

1. 1994–2014

   TU3 1.4 75 hp 8v (TU3JP/TU3KFX, 1994-2014)

   This is the entry-level version of the whole family: a single camshaft, 8 valves and multipoint injection. It stayed almost unchanged as the entry engine for Peugeot and Citroën for two decades, even when the rest of each model's range was already using more modern engines (VTi, THP, ET3).^[5][6][15]

2. 1994–2005

   TU5 1.6 88-90 hp 8v (TU5JP, from 1994)

   Capacity rises to 1,587 cc from the TU3's 1,360 cc to give a little more power and torque while keeping a single camshaft and 8 valves; it was introduced in March 1994 as a middle option between the entry-level 1.4 and the 16-valve versions.^[1][6][7]

3. 1999–2010

   TU5 1.6 16v 109-112 hp (TU5JP4/TU5NFU, from 2000)

   Adds a second camshaft and 16 valves to raise output to 109-112 hp. It debuted around the year 2000 in the Citroën Xsara, and from there passed to the rest of the Peugeot and Citroën range, including vans such as the Peugeot Partner.^[6][7][8]

• Timing kit

  • Buy part at Autodoc (affiliate link, opens in a new tab)

• Oil filter

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• Air filter

  • Buy part at Autodoc (affiliate link, opens in a new tab)

• Spark plugs

  • Buy part at Autodoc (affiliate link, opens in a new tab)