AAA Car Doctor John Paul references his own legendary frugality in this response to a Hyundai Santa Fe owner. We’re pretty sure he still hasn’t spent his communion money.
Q: I have a 2009 Hyundai Santa Fe and it had a check engine light come on the other day. I checked and I left the gas cap loose and cleared the light with my code reader.
Now a couple of days later the light is on again. I went to the local auto parts store and they scanned the car and came up with codes PO 2187 and PO 2189.
The guy at the parts store suggested an oxygen sensor problem, fuel pump or the mass air flow sensor. All of these are pretty expensive, the car runs great even with the check engine light on with one exception after stopping to get gas the engine cranked for a long time before starting, any suggestions?
A: In this particular case I have personal experience with my own car.
I was recently filling my car with gas and when I went to restart it, it cranked for a long time and then finally started. After driving about 50 miles to work the check engine light came on and when I checked for codes there were the same two codes stored as your car.
The way the system in your car and just about every engine works, in order to provide the best possible combination of driveability, fuel economy and emission control, the computer monitors the oxygen sensor voltage and adjust the fuel based on these readings. As always I checked the obvious, items such as leaking air intake hose, vacuum leaks and electrical connections.
What I came up with and most likely what is the problem with your vehicle is a faulty evaporative emissions purge valve. The purge valve controls how much fuel vapor is drawn from the charcoal canister into the intake manifold. If the valve is stuck open it will cause the codes you came up with.
This video shows a different code, but the purge valve replacement procedure is the same:
The purge valve is located at the back on the engine on the intake manifold (not easy to get to). The installation is simple: one electrical connection and two vacuum lines. The part from a Hyundai dealer is about $120, about a $100 for an aftermarket part from a local auto parts store and $56 online for a quality part made by Bosch .
If you have read about my frugality, it won’t be hard to guess which part I purchased.