Lexus IS250 IS220d GSE20 ALE20 4GR-FSE EMISSION CONTROL

AIR FUEL RATIO SENSOR (for Sensor 1) - INSTALLATION

1. INSTALL AIR FUEL RATIO SENSOR (for Bank 2 Sensor 1)
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Using SST, install the sensor to the exhaust manifold LH.

  • SST
  • 09224-00010
  • Torque:
  • 40 N*m{ 408 kgf*cm, 30 ft.*lbf}
  • HINT:
  • Use a torque wrench with a fulcrum length of 300 mm (11.81 in.).

Connect the sensor connector.

2. INSTALL AIR FUEL RATIO SENSOR (for Bank 1 Sensor 1)
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Using SST, install the sensor to the exhaust manifold RH.

  • SST
  • 09224-00010
  • Torque:
  • 40 N*m{ 408 kgf*cm, 30 ft.*lbf}
  • HINT:
  • Use a torque wrench with a fulcrum length of 300 mm (11.81 in.).

Connect the sensor connector.

3. INSTALL NO. 3 RELAY BLOCK ASSEMBLY
4. INSTALL EXHAUST MANIFOLD SUB-ASSEMBLY LH
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the exhaust manifold to the gasket shown in the illustration.

Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the exhaust manifold sub-assembly LH with the 6 nuts.

  • Torque:
  • 21 N*m{ 214 kgf*cm, 16 ft.*lbf}
5. INSTALL ENGINE ROOM RELAY BLOCK ASSEMBLY
6. INSTALL NO. 4 ENGINE WIRE
7. INSTALL NO. 1 RELAY BLOCK COVER
8. INSTALL BATTERY TRAY
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the battery tray with the 2 bolts.

  • Torque:
  • 5.0 N*m{ 51 kgf*cm, 44 in.*lbf}
9. INSTALL POWER STEERING ECT ASSEMBLY
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Connect connector (c) to the power steering ECU assembly.

Connect 2 power steering ECU assembly connectors (a) and (b) and securely lock the connectors.

Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the power steering ECU assembly to the battery tray with the 3 bolts.

  • Torque:
  • 5.0 N*m{ 51 kgf*cm, 44 in.*lbf}

Install the No. 1 battery tray support.

10. INSTALL BATTERY

Install the battery.

Install the battery insulator.

Install the battery clamp with the 2 nuts.

  • Torque:
  • 2.9 N*m{ 30 kgf*cm, 26 in.*lbf}

Connect the positive (+) battery cable to the battery.

  • Torque:
  • 5.6 N*m{ 57 kgf*cm, 50 in.*lbf}

Connect the negative (-) battery cable to the battery.

  • Torque:
  • 5.6 N*m{ 57 kgf*cm, 50 in.*lbf}
11. INSTALL FRONT EXHAUST PIPE ASSEMBLY
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Using a vernier caliper, measure the free length of the compression springs.

  • Minimum length:
  • 38.5 mm (1.516 in.)

If the free length is less than the minimum, replace the compression spring.


Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install a new gasket to the rear end of the front exhaust pipe.

  • NOTICE:
Be careful with the installation direction of the gasket.
Do not reuse the gasket.
To ensure a proper seal, do not use the tail exhaust pipe to force the gasket onto the front exhaust pipe.
  • HINT:
  • Using a plastic hammer, uniformly strike the gasket so that the gasket and front exhaust pipe are properly fit.

Install 3 new gaskets and front exhaust pipe assembly.

  • CAUTION:
  • Do not reuse the gaskets.
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the 2 bolts and 2 compression springs.

  • Torque:
  • 43 N*m{ 438 kgf*cm, 32 ft.*lbf}
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install 4 new nuts and 4 bolts.

  • Torque:
  • 62 N*m{ 632 kgf*cm, 46 ft.*lbf}
  • NOTICE:
  • Do not reuse the nuts.
12. INSTALL HEATED OXYGEN SENSOR
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Before installing the heated oxygen sensors, twist the sensor wires counterclockwise 4 turns.

Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Using the SST, install the heated oxygen sensors to the front exhaust pipe.

  • SST
  • 09224-00010
  • Torque:
  • 44 N*m{ 449 kgf*cm, 33 ft.*lbf}

After installing the sensors, check that the sensor wires are not twisted.


If the sensor wires are twisted, reinstall them.

Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the grommets of the heated oxygen sensors.

13. INSTALL FRONT CENTER FLOOR BRACE
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the front center floor brace with the 4 bolts.

  • Torque:
  • 7.4 N*m{ 75 kgf*cm, 65 in.*lbf}
14. INSTALL REAR NO. 1 FLOOR PANEL BRACE
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the rear No. 1 floor panel brace with the 4 bolts.

  • Torque:
  • 19 N*m{ 194 kgf*cm, 14 ft.*lbf}
15. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
16. PERFORM INITIALIZATION

Perform initialization .

  • NOTICE:
  • Certain systems need to be initialized after reconnecting the cable to the negative (-) battery terminal.
17. INSTALL ENGINE ROOM SIDE COVER LH
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the side cover with the 5 clips.

18. INSTALL ENGINE ROOM COVER SIDE RH
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the side cover with the 2 clips.

19. INSTALL COOL AIR INTAKE DUCT SEAL
Air Fuel Ratio Sensor (For Sensor 1) - Installation. 4GR-FSE EMISSION CONTROL. Lexus IS250 IS220d GSE20 ALE20

Install the intake duct seal with the 11 clips.

20. EXHAUST GAS LEAKAGE

If exhaust gas is leaking, tighten the related parts to stop the leak. Replace damaged parts as necessary.


LEXUS IS250, IS220d / GSE20 ALE20