![]() They keep it up near the key cylinder, and apparently using a completely different key in the cylinder (so there are two different RFID chips communicating) is not a problem. I think I have read of people in a similar situations who cut one head off their old key just to keep the immobilizer system happy. My problem fixed itself, so I never ended up needing to actually change anything. So if you need to get new (different) keys, then you would need to make changes to your ECU. The things that must match are the RFID chips in the key heads and the code chips on the ECU. From discussion with mechanics, it sounds like that part only fails due to destruction when somebody tries to steal the car. ![]() So on my '99, I could have replaced just that part with no need for re-coding anything. That stuff out by the key cylinder is just un-coded electronics for sending signals back and forth to the key. what is in my '99 EX, but at least on my '99, the actual code was stored on chips in the ECU. When you refer to your "immobilizer" I will assume you mean that part number you listed earlier. Buy for Honda Odyssey 2003 2004 Ignition Switch with Lock Cylinder Coded Bolt On Replacement for 35100S0XA11: Ignition Starter - FREE. I believe I need this part: 35100-S0X-315NI All I need is to replace the cylinder, and getting it in and out is a breeze, but I don't understand what needs to happen with the immobilizer I am a little confused about my next step and how to achieve it. He are my questions that I would appreciate help with:ġ) Can I replace the unit and use my old imobolizer? If I do this, will my new keys need to be programmed to my old immobilizer? Is that possible?Ģ) Do I buy the unit with a new immobilizer that works with the new keys and then have the van programmed?ģ) how do I do the repair and drive it to get programmed if the unprogrammed immobilizer keeps the car from running? There is more to the story but I will spare you folks the details. Locksmith said he can't repair the cylinder unless the key worked. Taking it out was simple and I brought it to a locksmith for repair. Now I know I had to repair or replace the the ignition cylinder/steering lock. I left the key in the ignition and drove it for a month until the other day when the new key would not turn and would not come out. It worked, but I did not want to take it out because I didn't trust it. That was not going to work so I had the dealer make me a new key from code ($35) and tried that. Honda quoted me $800 to replace and reprogram. I knew I needed to replace or repair the cylinder. Eventually, the key would not turn at all and I therefore could not start the van. The key would only turn in the cylinder after much wiggling and pulling. I was having a problem with my key and ignition on my 2004 EXL. Ignition switch steering lock and immobilizer
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