XJ-8L Sedan (X308) V8-4.0L (AJ27) (2001)
5. CAUTION: Note the position of the upstream and downstream (where fitted) oxygen sensor multiplugs for reassembly.
Disconnect the oxygen sensor multiplugs.
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Release the multiplugs from the engine mounting bracket.
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Disconnect the plug(s) from the oxygen sensor(s)
6. Remove the four nuts which secure the downpipe catalytic converter to the exhaust manifold.
7. Raise the vehicle on a ramp.
8. Remove the downpipe catalytic converter.
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Remove the bolts which secure the downpipe lower mounting bracket.
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Remove the downpipe assembly.
9. Remove gasket from the manifold flange.
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Clean and inspect the manifold joint faces.
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Clean and inspect the threads on the downpipe studs.
Installation
1. Fit a new gasket to the manifold mating flange on the downpipe.