Question about 1999 Honda Odyssey

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EGR valve & 3rd gear pressure switch

Where can I find a diagram or manual on where or how to replace the EGR valve on a 1999 Honda Odyssey? Also the 3rd gear pressure switch is needing replaced....I would appreciate any help...considering the dealer wants 500.00 for the EGR and 250.00 for the pressure switch in labor alone....I know the parts are 100-150 a piece...but 1,000.00 for parts and labor is ridiculous. Thanks

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  • Anonymous Jul 30, 2008

    how to replace the EGR ?

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2 Answers

I fonud out today that the only place to get the 3rd clutch press sw is from the dealer. It only cost $70. It's a harness type switch (external to the transmission) so it shouldn't be that difficult to replace.

Posted on Aug 01, 2008

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  • Honda Master
  • 5,568 Answers

I highly recommend you buy an aftermarket service manual from Haynes or Chilton.
They are based on a complete tear-down and will not only help you with this problem but will give you an idea if the service shop is being honest about the amount of labor involved.

EGR valves are normally found on the exhaust manifold or header.
This is where they get the gases that are recirculated into the intake.

The other problem I can't comment on but the manual would surely help.

Posted on Jun 18, 2008

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Read more: http://engine-codes.com/p0798_honda.html#ixzz3YiQY8JvC

The Engine Control Module (ECM) uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear). Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical troubles of the shift solenoid valves and valve body.

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"The TCS indicator will come on if one or more of the following components are faulty:
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1 Answer

2001 honda odyessy has the following trouble codes: P1491, P0401,P1739. It has also been turning over longer before starting and has cut off while in park and idling. What does this mean?


P1491= "exhaust gas recirculation valve insufficient lift."
P0401= "exhaust gas recirculation insufficient flow"
P1739= ""3rd clutch pressure switch" (automatic transmission code)

the exhaust gas recirculation (EGR) valve is vacuum operated. there may be a vacuum line that is broken or leaking or become detached from the EGR valve. any vacuum leak will cause the engine to run lean, leading to poor starting and idle cut-off due to lean fuel fuel mixture.

The EGR valve has a vacuum diaphragm inside it. this diaphragm could be leaking. the EGR valve will need to be replaced if this is the case.

The P1739 code shows that a problem with the 3rd clutch pressure switch or the wiring leading to the switch has been detected. It may be an intermittent fault. Reset the trouble codes and drive for a while and see if this code returns. If so, check the wiring and switch operation of the 3rd clutch switch.

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