the abs started acting up and its? I have a 1999 lexus rx300 with almost 152,00 on it. I hardly use it because the abs started acting up and its was diagnosed that it was the rear right speed sensor. I got a new battery but it dies when not used for 10-14 days so now I make sure I use it on fridays. Today when driving the check engine came on. what is it. For a long time I had always complained of the very loud booming engine noise. What can it be... its out of warranty and dont want to go to the dealers since they will kill me. However I got the diagnose of the rr speed sensor from them and were asking 500, that was last yr but haven't got extra money to fix it. help