Have had codes p0451 and p0496 for the past 10k miles, have replaced gas cap with OEM and FTPS and PCSV and CCV. Codes always come back after DTC clear. I have checked all rubber lines and they are all 100% intact as I have replaced them all.
Today I am driving home and the light comes back on (expected after 20 miles or so after a clear) and as always I plug my OBDII reader in and I get NO p0451 and NO p0496 instead I get a p0132 and a p0328. I have been hearing the "clicking" noise everyone talks about in these 1.6L motors and as I said I have replaced the notorious PCSV valve and all the emission components.
My question is, has this just been a failing o2 sensor for the past 10k miles and now the PCM sees that that is the real problem and is holding off on the EVAP codes? Do I replace the o2 sensor and see if the knock sensor code goes away? Will that keep the EVAP codes away?
I understand what the code definitions mean, I just do not have more diagnostic abilities and was wondering if anyone has ran into this problem before. Any help is much appreciated, I am a student in college (with limited finds) and need my car to get me to and from school here in Miami, preferably without a MIL light on.
Quick note, the vehicle in question was a Illinois vehicle for the first 3 years of its life, now it is in the Florida sun (do not know if heat or cold is playing a factor in this issue).
Will put my email on here as I am really in need of any insight. Thanks for reading!!
Best to try a diagnoses to save on replacement parts.
Any help is greatly appreciated! Thanks in advance! Let me know if there is anything else I can get you, I can try a different scanner to retrieve the fuel trim data later today.
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P0132 freeze frame data?
Post Lt/St fuel trims taken at idle and at 3000 RPMs/under load for at least 30 sec.
P0496 freeze frame data?
Take a look at the trouble codes this forum. There are a couple of specific Hyundai causes for P0496.
Also had a p0172 (system too rich) pending code show up...
If any of the other codes set in the next couple drives I will post freeze frame data.
Isn't this kind of odd that there are so many codes and the vehicle is still running ok? electrical??
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Since P0446 is set, test the vent valve circuit for proper operation.
BBBind.com has electrical schematics.
You have already changed the canister vent valve correct?
These evap codes can all relate to a leak in the evap system.
If associated valves/circuits check out then have a shop do a smoke test to determine if there is a leak in the connecting hoses. Difficult to find without smoke test.
Here is the SFT that was requested. 3k RPM at steady throttle.
Also important note car is having big difficulty starting after refueling any amount filled car dies a couple times and idle erratic if I rev to recover it stays revving after I release throttle for a couple seconds, then runs perfectly fine....It's very strange.
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If this code is being set when you have difficulty starting after fueling could be engine
receiving excess fuel from evap canister thru the purge valve.
First fix the P0446 since its a more clear cut problem.
Fuel trims appear normal at 3k RPMs.
The PCSV valve behind the throttle body tested good on ohms, the connector did not test proper for voltage....I investigated from there...
Upon removing the intake assembly and connector for PCSV, I noticed the typical oil seepage from the throttle body that tends to occur on high mileage vehicles. An important note is that it seeps directly on the PCSV connector harness and the harness faces the 'up' position plugged in. I took a cotton swab and pushed lightly into the male connector (on the car wiring harness) and it came back with oil on it...from there I took another new cotton swab and used ISP to clean the connector and the prongs on the PCSV valve. Also the wire was chaffed directly where it runs under the throttle body on the top side, re-taped the exposed wire and after reassebly, and multiple run cycles, the code has disappeared. I refueled at a gas station about half a tank, and the car started immediately without pause and in general is running a lot smoother, especially at low RPMs. I hope that my discovery has been helpful, happy it didnt cost me a penny to fix also! Thanks for your help cj1
Codes are back. Just posting freeze frame data to see if there is anything odd seen here. It is going to mechanic this weekend, will post results and issues after the weekend...about done with these Hyundai issues, time for an American car soon.
Evaporative Emission System Pressure Sensor/Switch Range/Performance
Evaporative Emission System High Purge Flow
Evaporative Emission System High Purge Flow
View Freeze Frame
EQ_RAT () 0.999
If anyone sees anything here that could point to a problem, please let me know, much thanks!
Comeback work for same codes should be covered under warranty.
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