Focus Fanatics Forum banner

1 - 13 of 13 Posts

·
Registered
Joined
·
179 Posts
Discussion Starter #1
Okay, I've owned this car a month, and it's going to the shop a fourth time now.

After new TCU, clutch and seals, the car started throwing P0420, catalytic converter below threshold efficiency. I don't have a ton of miles on this car, about 75k(120,000 km) which shouldn't be too much, yet. The fact that it closely follows transmission service makes me think something either smacked the O2 sensor, or induced a leak. Naturally, dealership says impossible.

You'd think they would remember how loud I can complain in their showroom.

Suddenly tech checks, and somehow the cat is under warranty. Well, fine, I guess.

I bought this because I didn't want a car that needed fixing on the weekends so that I could get to work during the week. Well, come summer, at least I should have an option....
 

·
Registered
Joined
·
13 Posts
Would also love to know if its actually the cat that's gone bad or just sensors.

I have 191,000KM and CEL just came on with this code.

O2S1 replaced at 160,000 KM



Edit:

Please see recall #18S32
 

·
Registered
Joined
·
315 Posts
Would also love to know if its actually the cat that's gone bad or just sensors.

I have 191,000KM and CEL just came on with this code.

O2S1 replaced at 160,000 KM



Edit:

Please see recall #18S32
Did you replace the sensors? I've had this intermittent CEL since about 102k mi and thought it was related to the recall you mentioned. I wasn't that lucky, and will be replacing my sensors to see if the CEL goes away.
 

·
Registered
Joined
·
179 Posts
Discussion Starter #4
Well the dealership replaced the cat, but not the O2 sensors, and the CEL went away. Of course they also replaced the gasket in the exhaust system, which is also a possible source of the problem.

Most times O2 sensors don't go bad too quickly, unless you're burning something unusual, like oil or sometimes certain cleaners. Also using certain sealants in the intake system can result in fumes which harm O2 sensors (Most RTV is now marked "sensor safe" and does not produce these fumes.) I've also brought back some O2 sensors by heating it with a nice clean flame, like a propane torch and burning off contamination, but usually it's more cost effective to just buy a new sensor, so long as you've fixed the problem that caused it to foul.

Anyway, the dealership said it was the cat which failed because of the purge valve issue, which also got me a new gas tank.

Now I need to get my backup camera working again. This car has been a parade of problems so far...
 

·
Registered
Joined
·
13 Posts
Would also love to know if its actually the cat that's gone bad or just sensors.

I have 191,000KM and CEL just came on with this code.

O2S1 replaced at 160,000 KM



Edit:

Please see recall #18S32
Did you replace the sensors? I've had this intermittent CEL since about 102k mi and thought it was related to the recall you mentioned. I wasn't that lucky, and will be replacing my sensors to see if the CEL goes away.



After about 1 000km CEL went away and never came back.

Hopefully Ford comes with a fix for this recall soon though
 

·
Registered
Joined
·
315 Posts
Dang. I was hoping my dealership would be a bit better. I was just told that the cat wasn't covered in the recall and that I was on my own. Figures.
 

·
Registered
Joined
·
315 Posts
I didn't. I decided to walk and hope the CEL would go away after the recall repair. I'm trying the O2 sensor on my own to see if that works. I'm not interested in hundreds of dollars for a new cat.
 

·
Registered
Joined
·
179 Posts
Discussion Starter #9
I was told that the warranty on the cat was extended, probably due to the purge valve recall. I have 120,000 km, they checked up to 140,000 for the warranty coverage, so I don't know if 160,000 would still be covered.
 

·
Registered
Joined
·
165 Posts
My P0420 started at 98k miles. TCM had been replaced by Ford at 75k. I replaced the purge valve first and the P0420 kept coming back every 5k-8k miles. I finally replaced the downstream o2 sensor and added an o2 sensor extender and this fixed the problem. My cat isn't clogged or anything and I now have nearly 146k miles on it with no trouble codes and has passed emission testing.

see here: https://www.focusfanatics.com/forum/mk3-focus/794402-98-000-miles-intermittent-p0420-solved.html
 

·
Registered
Joined
·
150 Posts
It's funny how you guys complain about the price of a cat for your Focus when i own a 2007 Mazda RX-8. The cat for that car is $1,500.00 from Mazda :-O
 

·
Registered
Joined
·
72 Posts
It's funny how you guys complain about the price of a cat for your Focus when i own a 2007 Mazda RX-8. The cat for that car is $1,500.00 from Mazda :-O
Okay, but it's an RX-8, you should expect everything to be 3-4 times more expensive. We Focus drivers aren't made of money. If you're going to compare maintenance prices across brands and cars, compare the Focus to something like a Honda Civic, not an RX-8. Apples and Oranges. [???:)]
 

·
Registered
Joined
·
185 Posts
for those in the USA:
catalytic converters, electronic emission control units, and onboard emission diagnostic devices are covered under a design and defect warranty for 8 yrs or 80k miles under the clean air act of 1970 and clean air act amendments of 1977 and 1990 <LINK>

as for canada:
all i could find was the canadian environmental protection act of 1999 and a vague reference to the 'emissions warranty' .........
 
1 - 13 of 13 Posts
Top