2007 Mazda 3 Sensor Issue?

Old January-19th-2019, 07:07 PM
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2007 Mazda 3 Sensor Issue?

I have a 2007 Mazda 3 (~185k miles) that recently began having issues. The issues were first noticed when I got in, started it up, and put it in reverse. The reverse gear jerked hard (enough to spill my coffee). I also noticed that when I pressed the accelerator, the car did not rev or accelerate backwards (or forwards in D for that matter). Hadn't changed the fluid in a while, so I completed a drain and fill on it. No help. Checked the OBD codes on the car. Several came back (P0441, P2177, P050A, P0123, P0126, P0128). Still stuck on the transmission, I thought it could be one of the speed sensors on the tranny. But, no P0715 or P0720. May be there and my code reader does not capture TCM codes, not sure.

Then, I started Googling and reading some about the symptoms indicated by the codes. Even though a throttle position sensor was referenced, I cannot find much that says this car even has one, at least not independently that can be serviced/replaced. Thought it could be the MAF. I pulled it out and cleaned it (spray cleaner, no touch/brushing). After re-installing the MAF, the car will not start at all.

I cleared the codes and then scanned again. Only one code, P2135. Indicates throttle/pedal position sensor. Looks like it is behind the gas pedal. I am OK with replacing it if that is what is needed, but it is an expensive part and I would like to be more confident that this is it before spending the money. Makes sense to me that this may be it given the fuel/air mix, injector, intake air, throttle position sensor variety of the original codes I pulled. Also, the non-acceleration when pressing the gas pedal seems to go with the sensor not recognizing the pedal position change.

Anything else I can do to confirm what is wrong here?

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