ron b. 11/12/2010
2001 Toyota MR2 Spyder Base 4 Cyl 1.8L
engine light on codes are PO135 & PO300. what are they and location of the problem sensors?
02 sensor is named heater circuit bank 1 shop wants $900.00 for repairs. Sound like it is too much?
The B1S1 Oxygen (O2) sensor is the passenger side upstream O2 sensor. Replace it and probability of code P0135 not returning is greater than 75%. P0300 is a random misfire. In the absence of other codes besides P0135, it can have multiple causes however the most common cause is a faulty air flow meter. Here is the air flow meter for $110 and here is the O2 sensor for $63. So total of $173 in parts - free shipping. The air flow meter is a piece of cake to change and the O2 sensor is a little harder than a walk in the park. Try it yourself as you have a high probability of solving the problem with both codes.