Okay, before I start replacing parts, I want to make sure I am asking all the right questions. The "COOLANT" annunciator came on first, and about three hours later the check engine light came on. I checked the coolant level, and it was slightly low, but I did not see any leaks. I added coolant, and brought the car to auto zone to get the codes and they gave me the "H02S Bank 1 heater control circuit sensor 1 and 2 low." So, I started digging in my Haynes manual and noticed the coolant light is triggered by the Engine Coolant Temperature Sensor (ECT) which helps the Powertrain Control Module (PCM) control the air/fuel ratio. The upstream and downstream 02 sensors (both of which are causing the P0030 and P0036 codes) also help the PCM control the air/fuel ratio. So, is there one problem that could be casusing all three sensors to be acting up, or should I just bite the bullet and replace all three? Thanks
have the same problem?
Saturday, June 12th, 2010 AT 11:51 AM