Mazda Repair Questions? Ask Mechanics for Answers ASAP
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You have a DPFE (EGR pressure) code as well as a Bank 2 sensor one HO2S code and two cylinder misfire codes, is the engine actually misfiring?If you clear all of these codes which ones reset?
A leaking exhaust system can cause the DPFE code to set and can dilute the exhaust enough to cause a HO2S code to set as well so until the leak is resolved I would ignore the P1405 and the P1151 codes. The codes to focus on would be the misfire codes on cylinders #1 and #2. Because both cylinder misfire codes are coming up and your low on power have you by chance ran a compression test on cylinder #1 and #2?
If you can fix the exhaust leak you may also solve the DPFE code as well as the HO2S code at the same time. Let read compression on these two cylinders and we can work from there.
Normal compression should be at least 125 to 135 PSI give or take on all cylinders. If your getting 100 and 105 and 65 then you have a worn engine. The cylinder with 65 PSI will not even fire because the compression is just to low. Depending on how many miles you have on the engine a valve job would likely correct this .
Yes they should have been if you had the head reworked.
If your compression readings are accurate then your machine shop that did the heads need to have another look at there head work. The only other thing that can give you such low compression readings would be worn piston rings and if in fact that is the case you would usually also have smoke out the exhaust as well.
That is a slight possibility but more likely the valves where not reworked properly. If there not seating properly it will cause low compression.
Yes that is where I would start. Let them know your compression reading as well.
Okay thank you as well.