- Replacement of air fuel ratio sensor (sensor 1)
- Gas leak from exhaust system is repaired
| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001BMNZ |
| Model Year Start: 2019 | Model: Avalon HV | Prod Date Range: [04/2018 - ] |
| Title: A25A-FXS (INTAKE / EXHAUST): EXHAUST MANIFOLD: REMOVAL; 2019 - 2022 MY Avalon HV [04/2018 - ] | ||
REMOVAL
CAUTION / NOTICE / HINT
The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during exhaust manifold (TWC: Front Catalyst) removal/installation are shown below.
Necessary Procedures After Parts Removed/Installed/Replaced
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Replaced Part or Performed Procedure |
Necessary Procedure |
Effect/Inoperative Function when Necessary Procedure not Performed |
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Inspection After Repair |
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CAUTION:
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To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
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To prevent burns, do not touch the engine, exhaust pipe or other high temperature components while the engine is hot.
PROCEDURE
1. REMOVE FRONT FLOOR COVER LH
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![2019 - 2022 MY Avalon HV [04/2018 - ]; A25A-FXS (INTAKE / EXHAUST): EXHAUST PIPE: REMOVAL+](/t3Portal/stylegraphics/info.gif)
2. REMOVE FRONT FLOOR COVER RH
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3. REMOVE FRONT CENTER FLOOR BRACE
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4. REMOVE CENTER FLOOR CROSSMEMBER BRACE
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5. REMOVE FRONT EXHAUST PIPE ASSEMBLY (TWC: Rear Catalyst)
CAUTION:
To prevent burns, do not touch the engine, exhaust pipe or other high temperature components while the engine is hot.
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(a) Disengage the wire harness clamp. |
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(b) Disconnect the air fuel ratio sensor (for sensor 2) connector.
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(c) Remove the 2 bolts, 2 nuts and disconnect the front exhaust pipe assembly (TWC: Rear Catalyst) from the exhaust manifold (TWC: Front Catalyst) and center exhaust pipe assembly. |
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(d) Remove the front exhaust pipe assembly (TWC: Rear Catalyst) from the 2 exhaust pipe supports.
(e) Remove the 2 gaskets from the front exhaust pipe assembly (TWC: Rear Catalyst).
6. REMOVE FRONT LOWER NO. 1 FLOOR HEAT INSULATOR
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7. REMOVE FRONT WHEEL OPENING EXTENSION PAD LH
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8. REMOVE FRONT WHEEL OPENING EXTENSION PAD RH
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9. REMOVE NO. 1 ENGINE UNDER COVER
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10. REMOVE NO. 2 ENGINE UNDER COVER ASSEMBLY
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11. REMOVE COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY
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12. REMOVE FRONT CENTER UPPER SUSPENSION BRACE SUB-ASSEMBLY
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13. REMOVE AIR FUEL RATIO SENSOR (for Sensor 1)
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14. REMOVE WIRE HARNESS CLAMP BRACKET
CAUTION:
To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
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(a) Remove the bolt and wire harness clamp bracket. |
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15. SEPARATE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR
CAUTION:
To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
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(a) Remove the 5 bolts and separate the No. 1 exhaust manifold heat insulator from the exhaust manifold (TWC: Front Catalyst). |
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16. SEPARATE NO. 1 UPPER FRONT FLOOR HEAT INSULATOR
CAUTION:
To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
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(a) Remove the 2 nuts and separate the No. 1 upper front floor heat insulator from the vehicle body. |
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17. REMOVE MANIFOLD STAY
CAUTION:
To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
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(a) Remove the bolt, nut and manifold stay from the exhaust manifold (TWC: Front Catalyst) and cylinder block sub-assembly. |
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18. REMOVE EXHAUST MANIFOLD (TWC: Front Catalyst)
CAUTION:
To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
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(a) Using a 12 mm deep socket wrench, remove the 7 nuts and separate the exhaust manifold (TWC: Front Catalyst) from the cylinder head sub-assembly. |
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(b) Remove the No. 1 upper front floor heat insulator, No. 1 exhaust manifold heat insulator and exhaust manifold (TWC: Front Catalyst).
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(c) Remove the exhaust manifold to head gasket from the cylinder head sub-assembly. |
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19. REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR
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(a) Remove the 6 bolts and No. 2 exhaust manifold heat insulator from the exhaust manifold (TWC: Front Catalyst). |
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