Check Engine Light On on 1999 Honda Accord

My check engine light came on and my brother-in-law ran a diagnostic with the resulting code of P0740. (Honda has 135,000 Miles). I took it to a mechanic and he told me that I need to replace the transmission. I don't believe this because the car drives without any gear change issues. It runs very smoothly. Someone else told me it could be the O ring that needed replacement. And I called my Honda dealer to ask about changing the transmission fluid and filter and was told that this model did not have a filter. I asked about changing the screen and he told me that this was not done either. Honda wants to run their own diagnostic on it for $70.00. From my experience with them, they usually come up with several other things that "need" to be done. Any suggestions on how to proceed would be helpful.

by in Montgomery Village, MD on February 01, 2011
2 answers
ANSWER by on February 01, 2011
Hi I would recommend to change the fluid with the right Honda approved fluid then clear the code and drive and see if it returns. Let me know if this helps. RJ
ANSWER by on October 06, 2014
It does have a filter inside the transmission but you have to take the trans out and then apart to do any at all ,with a 135000 on the clock its time to get another car , short one is with this trans they had design faults when they were first out ,if you check auto trans blogs and colums you will see modified valves for these units , if the fluid has not been changed for a long time debris builds up in the valve body and blocks the ports like the converter feed ,burn out is common with these types of trans , Long one short if you get a low mileage honda flush the trans fluid right out and fill with their DW1 and then change the fluid at or before 30,000 , they only take a small amount fluid compared to older types of trans and the fluid is prone to over heating hemce the amount of after market trans coolers and inline filters on the market . Go on to you tube and type in 99 honda auto you will soon get to see whats going on ! I own a 99 Accord auto and do my own mechanics Accords are a love hate thing i like the power ,i like the tiptronic shifter ,its comfortable has a lot room in the back for lugging stuff ,but its a knucle knocker and sometimes there is odd special tool you need , had they have thought it through and put a transmission with a pan on it on these cars they would have the bad reputation they have today ,and the people that bought them would not have the mega problems that they do with thise cars transmission. dont ask me to fix yours im in the UK, but good luck !
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