2000 XC junk box

A flashing the yellow transmission arrow accompanied by the check engine light indicates the automatic transmission detected a problem. This is often accompanied by the car going into "limp" mode, which is the same as "Winter" mode and the transmission stays in 3rd gear. The "limp" mode will normally reset the next time you start the car. The lights usually clear themselves in a couple weeks if it is not serious. When I had this happen on a '95 850, it was the "pnp" switch. However, the dealer replaced 1) the throttle position sensor, 2) the input speed sensor and 3) the output speed sensor first which were perfectly OK. I have heard of other people having the same problem. Bad "pnp" switches are fairly common. The code is usually 32x which indicates incorrect gear ratio for gear x or in my case 322, which meant it occurred in 2nd gear. Since it only occurred on one gear, it should have directed the mechanic to the "pnp" switch which detects which gear it is supposed to be in.