In February of 2008, the 1995 Accord that I now own (I bought it from my step-sister in 1/09) had it's engine replaced. It was a pull from a '96 Accord. As she drove it off the lot with the replacement engine, the drive 4 indicator light (D4) began to flash. This was the first time it ever happened. Her mechanic told her the timing was just a strange coincidence. My research has pointed me to transmission issues, but since the car drives and shifts PERFECTLY, it kind of slipped our minds. I bought the car from her in 1/09 not caring about the D4 indicator flashing, because like I said, it shifts fine to and from every gear. Here's the problem: I've been trying to sell the car for about a month now, as I've decided to get an 07-08 Ford Fusion. It's all your fault ZV, Skoorb, AndrewR, and Scoobmaster! Anyway, EVERY potential buyer is afraid of the D4 issue and runs away. It does not matter what I tell them. It has been a dealbreaker on FOUR different occasions now. I had it checked out by 3 mechanics. #1 He told me everything is fine and the codes are lying. The problem is due to small differences in the '96 engine compared with the original '95 engine. #2 He told me I need a new transmission. #3 I was told it was an uncommon problem and the solution would be to replace the Pressure switch on the side of the transmission. Three different transmission experts, and three different opinions. The light can be reset by any mechanic, but it comes right back as soon as I hit 5mph. Once I hit 5mph, the D4 ALWAYS blinks, until I turn the car off. It blinks even when in reverse or park. My questions: What the hell is going on? Could the mechanics who replaced the engine have caused this transmission D4 issue? Could the timing just be a very strange coincidence? How do I convince potential buyers that it is NOT an issue? (I honestly believe the transmission is fine, there are NO signs of slipping.) I very much look forward to hearing what you guys have to say about this, thanks!! EDIT 5/12/09 Today on the way to my dentist appointment, I passed Southwest Transmissions in Radford, VA. I figured what the hell I'm early for my dentist anyway, so I pulled in. Within 2-3 minutes of being there, they pulled the code: "LOCKED SOLENOID B". He then popped the hood and there were two plugs, right near the battery, one of which was UNPLUGGED!!!!! He plugged it in, and BAM problem fixed. Couldn't have been more than 10 minutes. I explained to them how I had been to three different places prior, and got three different expensive opinions. The kicker here is, they didn't even want to charge me! I threw them $40 anyway and thanked them profusely. I KNEW there was nothing wrong with my transmission. Maybe I can sell the car now. It mattered not to people that in the past 4 months, I have done the following maintenance: new timing belt, water pump, cam seal, crank shaft seal, valve cover gasket, ABS sensors, brakes, turned rotors, sway bar links, bushings, full exhaust, battery, cruise control servo, Power Steering Rack & Pinion and valve job. That damn D4 light scared all of them off regardless of all the work I have done. Anyway, topic resolved. Thanks for all the help!