• Mustang Forums
  • 2005 - 2014 S-197 Mustang -General/Talk-
  • 2010 - 2014 Specific Tech

2014 mustang gt roush stage 3...02 sensor issues

  • Thread starter Thread starter RS3NLV
  • Start date Start date Jan 20, 2019
R

RS3NLV

Member
Jan 20, 2019
2
1
13
Las Vegas, NV
Jan 20, 2019
#1
  • Jan 20, 2019
  • #1
So...I just purchased a used 2014 roush stage 3...I just rolled to 30k miles. Unfortunately, I'm already having 02 sensor problems. Right after purchasing the car, light came on. I got it scanned. P0430....bad 02 sensor OR at the ford dealer, They say I have a bad cat. In my opinion, I think the car runs like a champ with no miss fires or obvious problems. But im no mechanic, Just a guy who loves cars and mustangs alike. here are some facts (not in any order) about what Ive been experiencing.

1. pulled out oringinal 02 sensor. Looked like it got hot in its past...it was grey and white in some places.

2. Car is completly stock from roush. Stage 3, Phase 1. supercharged, with AXLE back Roush muffler kit and a ecu tune from roush...? (chime in if you know anything about this)

3. I'm already dealing with an UPHILL battle with ROUSH, FORD, the dealer I bought the car from. I have a powertrain warranty that is still good until 5/2019 and besides that, AN emissions warranty good for 96/mo or good for 75k miles or so...Dealers are not wanting to touch the car because they are labeling the Roush add ons as AFTERMARKET. Even though, FORD sells the car the way I have it now as it sits.

4. After a nightmare with dealership visit, and getting robbed 140 bucks to have a diagnosis done that I couldnt believe is true...P0430 translates as a BAD cat...a metal can cannot tell a computer that its not good. It takes a visual inspection, maybe debris in the tail pipe...and overall the car would run like crap (correct me if I'm wrong)

5. I went and bought my own NTK direct fit replacement 02 sensor. (bank 2 is the one Im having issues with. the one after the catalytic converter) After replacement, My light dissapeared for 2 days. My commute to work is about 20 miles round trip. hitting about 50 mph with intersections. I thought I was in the clear for those 2 days....remember I havent paid tax and registration on the car yet.

6. I know what your thinking....This car deserves long tubes and a full job done with a tune. I don't want to hurt my wallet that much if I can avoid it. I'm still trying to get something covered by warranty If I can. New exhaust for this car will be a major hit...Long tubes 700$, mid pipe w/cats another 700...not including installation and tuning My goal is to get the car to run properly...If I need a new cat....why? Are these cars prone to early failure? sensors alike? Ive also understood that the stock GT cats may not be suitable for a supercharged engine...And I completely agree If I can get a stock cat for now...just for registration purposes, that would be great. I don't feel like I should pay for it..Warranty is there for a reason, and FORD sold the car like this. Ill keep fighting on and keep the thread updated. Ford, I've heard is the WORST when it comes to warranty work. we'll see.

7. Should I be worried about how the car is running?? It sounds fine....pulls when you want it to. There has to be a mechanical reason for this. I could tune the car now...in its stock form...but thats still around 800 bucks. If I need to, I will.


Thanks for the info in advance. Let me know what you think or if you have any questions.
 

Attachments

  • roush and black 19 stang 2.webp
    15.4 KB · Views: 1,481
Last edited: Jan 20, 2019

shaneyusa

New Member
Jul 13, 2013
2
0
2
Boise
Feb 3, 2019
#2
  • Feb 3, 2019
  • #2
If the car has not been further modified from the original Roush modifications it should be honored. Make sure the car does not have an aftermarket tune applied, that could be the root of the problems. If it is setup with original Roush, then you should be able to get it covered. I have a 2014 Roush and the Ford warranty was promised at sale to be fully intact without question. I have only had mine serviced at the local Roush authorized dealer where I purchased. I have not had any warranty issues. Of course mine is a stage 2 and not supercharged, but I know the Stage 3 were also to be fully covered by the Ford warranties from the factory. It was a big saling point for purchasing a Roush in the first place. You will likely need to find a Roush authorized dealer, but all the Ford warranties should still stand. You might want to reach out to Roush Performance if you continue to have problems with the car. Best wishes on getting the beast running right.
 
You must log in or register to reply here.

Similar threads

M
93 5.0 Microsquirt with Stage 3 trickflow tuning issues
  • marxpreston11
  • Jun 22, 2026
  • Digital Self-tuning Forum
  • 2 3 4
Replies
67
Views
1K
Digital Self-tuning Forum Jun 25, 2026
Mustang5L5
K
Procharger Stage 2 - 2013 Mustang GT Minor Hiccups
  • KHills5058
  • Oct 9, 2025
  • 2010 - 2014 Specific Tech
Replies
0
Views
143
2010 - 2014 Specific Tech Oct 9, 2025
KHills5058
K
A
P0036 P0056 P0137 P0157 2020 Ford Mustang GT
  • AmkoA
  • Jun 16, 2026
  • 2024+ (S650) Mustang -General/Talk
Replies
0
Views
98
2024+ (S650) Mustang -General/Talk Jun 16, 2026
AmkoA
A
G
2006 Mustang GT o2 Sensor Wiring Issue Car Bogging/Choking
  • GCantero93
  • Sep 5, 2025
  • 2005 - 2009 Specific Tech
Replies
4
Views
984
2005 - 2009 Specific Tech Sep 6, 2025
Noobz347
K
TPMS Help
  • KirkACola
  • Jun 2, 2025
  • 2010 - 2014 Specific Tech
Replies
7
Views
366
2010 - 2014 Specific Tech Jun 25, 2025
SuperCharged_Coyote
S
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 2005 - 2014 S-197 Mustang -General/Talk-
  • 2010 - 2014 Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?