I have a 2003 s40 with 81k miles. My check engine and DSA lights have been coming on. Check engine all the time. DSA intermittent. Only symptom showing is periodic hard start. Car cranks 5-6 times before starting. Sometime starts right away. Code is p0122 tps. I have replaced this sensor and issue has not improved. I am wondering if it is the timing belt or crank position sensor. Not sure though.