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Hi Im David, thanks for visiting the site. hows the vehicle running? ok?
ok. give a a few minutes, we'll figure this out.
check for air intake leaks and unmetered air ....check for vacuum leaks. use a can of carb cleaner while engine is running ans spray it around every vacuum connection, throttle body and intake base. listen for rpm changing.
let me know if you find a leak. its running rich because the is to much air entering the engine.......
ok. let me think about this
With dual HO2S, DTC 173 refers to right or rear HO2S.HO2S always rich could be caused by:Moisture inside HO2S harness connector resulting in a short to power.HO2S circuit shorted to power.Key off.Disconnect the suspect HO2S from vehicle harness.Inspect both ends of the connector for damaged or pushed out pins, moisture, corrosion, loose wires, etc. Service as necessary.Key on, engine off.Measure voltage between HO2S circuit and PWR GND at the HO2S vehicle harness connector Is voltage less than 0.5 volt?
ok. thank you. i will let you know what the next step is shortly
im back and looking into this now
go to the coil. pull off the coil plug wire and Where it connects on the coil end the coil contact male and female look for corrosion how it . Clean it with electrical cleaner...
A smoke test will certainly find any leaks.
just checking in to see how its going
did you do a smoke test?
ok well im going to open up the question to others. im out of ideas. good luck
Hello, my name Dan. Thank you for using just answer. I am reviewing your question and will get back to you shortly. Thanks
Does the engine misfire?
If not, then replace the fuel pressure regulator. This is the most common cause for this code.
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Here is a link
Have you checked fuel pressure?