I changed the O2 Sensor, but it is still throwing up the 171 code. I've read that it is the intake manifold sticking. My problem is, where is this located, and how can I fix it? There isn't an abundance of information on the internet about this, though I've found some. It suggests spraying carb cleaner into the intake manfold, but I'm not sure where to do it. I don't have an abundance of money to take it into the shop, and I don't want to pay hundreds of dollars for someone to spritz some cleaner into the engine. Can you tell me where the imrc valve is and the best way of fixing this? Thank you for your help.