SOURCE: Check Engine code P1409
clean the egr valve port on intake use piece of clothes rack clean the built up carbon on inside of port.
SOURCE: power loss
Can't answer your last question but catalytic convertors that are just not working anymore won't cause any loss of power.
However, if they have shattered inside (they are kind of a ceramic honeycomb) they can dump junk into the exhaust system that can eventually clog your muffler or resonator.
Checking whether this has happened isn't difficult; after the warm up of the engine, either you or a helper needs to listen to the exhaust note.
If firing of the cylinders is still distinct, the system isn't clogged with shrapnel; if it seems to hiss at higher RPMs, it is likely clogged.
This effect is easy to miss; I've had two failures and when cold, the engine would pull fine because the chunks of ceramic would fall to the bottom of the muffler and glue together somewhat.
Once hot and agitated, they would clog the muffler and cause a severe loss of power but the idle would be OK.
A hill that I would normally pull at 70 MPH, I couldn't top at all; had to sit and wait for things to cool down before proceeding.
It also seems some engines appreciate a bit of back-pressure in the exhaust system because the car gained in mileage and pulling power for several thousand miles before the clog became critical causing the mileage to fall sharply along with the power.
SOURCE: engine light came on and code read po403 egr valve
This code is a cylinder number 8 glow plug failure. These can be read using an ohm meter.
A good plug will register between 0.6 - 2.0 ohms
SOURCE: PO720 - Output Speed Sensor Circuit Malfunction
i have 99 durango v8 5.9..the engine light is on and it gives me the code for the output speed sensor..it was driving fine then all the sudden i started it up to go somewhere and it would shift into 3rd or overdrive...i would step on the gas and the rpm's would go up
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