What does it mean when check engine light and TCS light come on at same time on '99 Honda Odyssey? (Engine Indicator Lights Honda Odyssey)

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Question Details Asked:Feb 16, 2008 - 07:50 PMStatus:Closed

bmo25	What does it mean when check engine light and TCS light come on at same time on '99 Honda Odyssey? I have a 99 Honda Odyssey. About a month ago the check engine light came on as well as my TCS light. It checked out as an EGR code. After hours of diagnosis, they tried to just replace the EGR valve. That shut off the code. Then it came on again about a week later, again with the TCS light. My mechanic suspected a faulty master computer because the code was telling him there was a communication problem. They found carbon built up in the intake and cleaned it out real good. This again shut the indicator lights off. Now it has come on again. Someone I was talking to said it sounded like it was a transmission issue. Can anybody tell me if this sounds like a transmission or a computer? The car seems to be running fine otherwise. Thanks.
	In Maintenance & Repair > Engine > Indicator Lights In Makes & Models > Honda > Odyssey 2 answers - 1620 days ago
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ljlemire 07/01/08 9:19 pm PST

It is typical of the Odyssey to get carbon build up in the intake and the diagnoses it as a false EGR code (the code it gave was probaly P1491) which will cause troble to,my sister had the same problem as the computer told me it was a bad EGR but simply cleaning out the intake fixed it but the fact is the EGR valve was probaly never bad it seems like it is a seperate problem with the TCS light. I would think its doubtful it involves the transmission if u have not noticed anything. The brakes can cause the TCS light to come on, as well as many other things. What code is the computer sending out now. Write back if the problem still persist, as I said my sister had the exact same problem and it was due to carbon buildup in the intake AND one of the slave cylinders for the brakes was faulty which in turn made the TCS lighty come on. FOR THE RECORD when having car problems it is smart to always get two or three seperate opinions from a certified mechanic as usually an estimate is free, but im sure as you know parts and labor will add up very quickly.

lrho 12/17/08 1:42 am PST

Hi, I wonder if you still have this problem and how you solved it if at all.
I have same thing on my Honda Accord 2001, LX V6. Both lights came on simultaneously, it seems like it happens when the car has just warmed up. I was said when the engine reaches certain temperature EGR valve opens and flows some exhaust gases back to the intake. I replaced EGR valve, and the problem disappeared for a week or so, namely 350 miles, Now the lights are on again following the same pattern. Before I replaced the valve the OBD code was P0401 "insufficient EGR flow". I doubt that I have intake clogged. I live in California and run on "plus" grade gas. It should not create build-up. The mechanic who I know well and trust mentioned to me as well that it might be a transmission issue, but the car runs smooth and does not post any transmission related codes.
Have your ever visited dealer with this problem?
So, if you have any info for me I'd appreciate it very much

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