This procedure covers removal and installation of the downpipe (front exhaust pipe) connecting the catalytic converter to the mid-pipe on a 2012-2017 Toyota Camry with 2.5L I4 engine.

Warnings

Tools required

Parts

• Downpipe (front exhaust pipe) × 1 — OEM 17410-0V010 or aftermarket equivalent
• Exhaust donut gasket (catalytic converter to downpipe) × 1 — Use OEM specification
• Exhaust flange gasket (downpipe to mid-pipe) × 1 — Use OEM specification
• Exhaust flange bolts/nuts (if corroded) × 4 — M10x1.25 exhaust hardware
• Exhaust hanger rubber isolators (if damaged) × 2 — Use OEM specification

Preparation

1. Park vehicle on level surface and allow exhaust system to cool completely (minimum 2 hours after operation)
2. Apply wheel chocks to rear wheels
3. Spray all exhaust flange bolts, hanger bolts, and O2 sensor threads with penetrating oil. Allow to soak for 15-30 minutes minimum
4. Raise front of vehicle and secure on jack stands at manufacturer lift points
5. Verify vehicle is stable before working underneath

Procedure

1. 1

   Remove heat shields
   Locate and remove any heat shields covering the downpipe and catalytic converter connection points. Remove heat shield mounting bolts using 10mm or 12mm socket. Set shields and hardware aside for reinstallation.
   Torque spec

   Heat Shield Bolts10 Nm (7 lb-ft)
2. 2

   Disconnect upstream oxygen sensor
   Locate the upstream oxygen sensor in the downpipe near the catalytic converter flange. Disconnect the electrical connector by pressing the release tab and pulling apart. Use 22mm O2 sensor socket to carefully unthread the sensor from the downpipe. Work slowly to avoid snapping the sensor body.
   ⚠O2 sensors are fragile. Never use excessive force or impact tools. If sensor will not turn after several attempts, apply more penetrating oil and wait.
   Torque spec

   O2 Sensor45 Nm (33 lb-ft)
3. 3

   Remove downpipe to mid-pipe connection
   Locate the flange connection between the downpipe and mid-pipe (center exhaust section). Remove the two flange bolts/nuts using 14mm wrenches. One wrench holds the bolt head while the other turns the nut. If fasteners are seized, apply heat carefully or use bolt extractor if broken.
   ⚠These bolts commonly seize. Have replacement hardware available. Do not apply excessive heat near fuel lines or brake components.
   Torque spec

   Exhaust Flange Bolts45 Nm (33 lb-ft)
4. 4

   Remove exhaust hanger supports
   Locate the rubber exhaust hangers supporting the downpipe (typically 1-2 hangers). Spray hanger bolts with penetrating oil if not already done. Remove hanger bolts using 12mm or 14mm socket. Use a pry bar to carefully separate rubber isolators from hanger brackets if necessary.
   Torque spec

   Hanger Bolts20 Nm (15 lb-ft)
5. 5

   Separate downpipe from catalytic converter
   Move to the front flange connection between the catalytic converter outlet and downpipe inlet. Remove the spring-loaded bolts or nuts (typically 14mm) securing this connection. There are usually 2 bolts with springs. Support the downpipe weight as you remove the final fastener.
   ⚠Downpipe will drop when final bolt is removed. Support the pipe to prevent damage to other components or injury.
   Torque spec

   Exhaust Flange Bolts45 Nm (33 lb-ft)
6. 6

   Remove downpipe from vehicle
   Carefully maneuver the downpipe down and out from under the vehicle. The pipe may require rotation and angling to clear subframe components and the transmission. Remove and discard the old exhaust gaskets from both flanges.
7. 7

   Clean flange surfaces
   Use a wire brush to thoroughly clean both the catalytic converter outlet flange and the mid-pipe inlet flange. Remove all carbon deposits, old gasket material, and rust. Clean surfaces ensure proper sealing and prevent exhaust leaks.
8. 8

   Prepare new downpipe
   Inspect new downpipe for shipping damage. Install new donut gasket onto the catalytic converter side connection. Place new flange gasket on the mid-pipe side connection. Apply anti-seize compound to all bolt threads that will be installed.
9. 9

   Install downpipe to catalytic converter
   Position new downpipe under vehicle and align with catalytic converter outlet flange. Ensure donut gasket is properly seated. Start both exhaust flange bolts by hand, threading them through the flange and springs. Do not tighten fully yet.
   Torque spec

   Exhaust Flange Bolts45 Nm (33 lb-ft)
10. 10

    Connect downpipe to mid-pipe
    Align the rear flange of downpipe with mid-pipe inlet flange. Ensure flange gasket is properly positioned between flanges. Start both flange bolts by hand. Do not tighten fully yet.
    Torque spec

    Exhaust Flange Bolts45 Nm (33 lb-ft)
11. 11

    Install exhaust hangers
    Align exhaust hanger brackets with rubber isolators. Install hanger bolts and tighten to specification. Ensure rubber isolators are fully seated in brackets and not twisted or damaged.
    Torque spec

    Hanger Bolts20 Nm (15 lb-ft)
12. 12

    Torque all flange connections
    Starting at the catalytic converter flange, torque the exhaust flange bolts to specification in a cross pattern. Then torque the mid-pipe flange bolts to specification in a cross pattern. Verify all connections are properly seated with no gaps at gasket surfaces.
    ℹ️Proper torque is critical. Over-tightening can warp flanges and cause leaks. Under-tightening will result in exhaust leaks.
    Torque spec

    Exhaust Flange Bolts45 Nm (33 lb-ft)
13. 13

    Install upstream oxygen sensor
    Apply a small amount of anti-seize compound to the oxygen sensor threads only (avoid getting anti-seize on the sensor tip). Thread sensor into downpipe by hand until snug. Use 22mm O2 sensor socket to torque to specification. Reconnect electrical connector until it clicks.
    ⚠Never apply anti-seize to sensor tip. Contamination will cause sensor failure and check engine light.
    Torque spec

    O2 Sensor45 Nm (33 lb-ft)
14. 14

    Reinstall heat shields
    Position heat shields over downpipe and catalytic converter areas. Install all heat shield mounting bolts and torque to specification. Ensure shields are not touching exhaust pipe or contacting moving components.
    Torque spec

    Heat Shield Bolts10 Nm (7 lb-ft)

Reassembly

1. Verify all exhaust connections are properly torqued and gaskets are seated
2. Check that all exhaust hangers are installed and rubber isolators are not damaged
3. Ensure O2 sensor electrical connector is fully seated and secured away from hot exhaust components
4. Verify heat shields are properly installed and not rattling or contacting exhaust pipes

Verification

• Lower vehicle from jack stands safely
• Start engine and listen for exhaust leaks at all flange connections (hissing or ticking sounds indicate leaks)
• Allow engine to reach operating temperature and inspect all connections for exhaust gas leaks
• Verify no check engine light is illuminated and O2 sensor is functioning (may require short test drive)
• Perform visual inspection under vehicle after test drive to verify no hangers have separated and all bolts remain tight
• Check for unusual rattles or vibrations that could indicate loose heat shields or improper hanger installation

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