Recent Topics
photo testing
by supton
08/01/14 10:49 AM
Fleet Farm Oil Sale
by bprat318
08/01/14 10:38 AM
overfilled oil
by Stang40
08/01/14 10:00 AM
PU 5w-30 API SN / 2,326 mi / 2012 Subaru WRX
by bicycle_wreck
08/01/14 09:59 AM
Mobil 1 rebate is back
by Poohbah
08/01/14 09:41 AM
Penrite Enviro+ 5w30 dexos 1, Rav4 2.0, 9000km
by supercity
08/01/14 07:27 AM
Any reason NOT to run 0w20?
by buck91
08/01/14 07:15 AM
Strange electrical problem with '04 Corolla
by grampi
08/01/14 06:56 AM
New oil additive saves 2% on gas
by bigt61
08/01/14 06:52 AM
Pennzoil Ultra Platinum - HTHS and TBN
by vinu_neuro
08/01/14 06:15 AM
streaming live sports
by sleepery
08/01/14 05:23 AM
8/1-8/31 NAPA Dollar Days
by tenderloin
08/01/14 01:52 AM
Newest Members
bmb31, amadi35, jdoucet, jdfay, kaesees
50819 Registered Users
Who's Online
95 registered (A_Harman, AdmiralYoda, 29662, andrewp1998, 10 invisible), 1983 Guests and 224 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
50819 Members
64 Forums
217150 Topics
3419398 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Page 4 of 4 < 1 2 3 4
Topic Options
#2558433 - 03/05/12 10:17 PM Re: P0420 Code... CAT or O2 sensors? [Re: Vikas]
TFB1 Offline


Registered: 09/03/10
Posts: 2622
Loc: VA
Here's how to fix that P0420...


Top
#2558481 - 03/06/12 12:01 AM Re: P0420 Code... CAT or O2 sensors? [Re: MysticGold04]
MysticGold04 Offline


Registered: 01/12/05
Posts: 1133
Loc: CA
ok.. so I found the last smog check.. done on 7/20/10 so it will most likely have to be tested again in July as CA does biannual inspections.

Here were the readings - keep in mind they put cars on the dyno.

15MPH Test: RPM@1794 HC PPM:37 (MAX:50) C0: 0.27 (MAX 0.64) NO PPM:444 (MAX:508) PASS
25MPH Test: RPM@1765 HC PPM:9 (MAX:34) C0:0.00 (MAX 0.78) NO PPM:22 (MAX:761) PASS

does it seem like the converter either wasn't fully warmed up... or does it seem to need replacement? Or can you even tell from these results?

I priced sensors today.. about $220 for both upstream and downstream Denso (OEM style sensors)
_________________________
'06 Focus SES 2.0 93,487 QSUD 5w30
'04 Highlander 2.4 157,521 Maxlife 5w30
"God is Great, Beer is Good, and People are Crazy." USA

Top
#2558586 - 03/06/12 06:41 AM Re: P0420 Code... CAT or O2 sensors? [Re: MysticGold04]
Trav Offline


Registered: 11/20/06
Posts: 9183
Loc: MA, Mittelfranken.de
Its hard to tell from these reading if there is any problem.
IMHO keep this as simple as possible. O2 sensors do get slow, in fact for many years some companies recommended 30K change intervals.
Today they can go much longer but personally over 100K i change them if i suspect a problem.

Whenever you change a cat its a good idea to swap them out anyway especially if they are in the 100k range, so swapping the O2's first makes sense.
If that doesn't cure the problem then you can change the cat. +1 on the Denso O2's, they are quality units.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

Top
#2559034 - 03/06/12 01:55 PM Re: P0420 Code... CAT or O2 sensors? [Re: MysticGold04]
MysticGold04 Offline


Registered: 01/12/05
Posts: 1133
Loc: CA
Thanks Trav..

I think I will run a bottle of techron, go burn some mileage on the highway, and get the O2 sensors on order, and go from there.

James: I just replaced the spark plugs with OEM Iridiums at 100k and also cleaned the TB at that time.
_________________________
'06 Focus SES 2.0 93,487 QSUD 5w30
'04 Highlander 2.4 157,521 Maxlife 5w30
"God is Great, Beer is Good, and People are Crazy." USA

Top
#2560753 - 03/08/12 02:07 AM Re: P0420 Code... CAT or O2 sensors? [Re: MysticGold04]
ltslimjim Offline


Registered: 08/06/10
Posts: 5143
Loc: PL&F
^As a note, the longer a PEA containing fuel system cleaner can remain in the gas tank the better. It isn't a stripping solvent but a detergent that is best used on a full tank that you will use over a longer during of time.
_________________________
1992 Civic VX 275k+
HG replaced, waiting to sample

Top
#2566212 - 03/13/12 11:40 AM Re: P0420 Code... CAT or O2 sensors? [Re: MysticGold04]
MysticGold04 Offline


Registered: 01/12/05
Posts: 1133
Loc: CA
Update:

I took the car out for a nice drive this past weekend with lots of high RPM miles to heat things up. Then as luck would have it, got a flat tire (sidewall) and interrupted my work. Anyhow, I replaced both O2 sensors, and reset the ECU. I also cleaned the MAF and cleared the codes. We will see what happens. I *did* notice the exhaust had a different smell when letting the car idle. Before the sensor changes, the exhaust smelled in excess of fuel. Now, not so much, so hopefully things are better! If not, I suppose a cat replacement is in order!
_________________________
'06 Focus SES 2.0 93,487 QSUD 5w30
'04 Highlander 2.4 157,521 Maxlife 5w30
"God is Great, Beer is Good, and People are Crazy." USA

Top
#2566226 - 03/13/12 11:59 AM Re: P0420 Code... CAT or O2 sensors? [Re: MysticGold04]
MysticGold04 Offline


Registered: 01/12/05
Posts: 1133
Loc: CA
Sidebar on the Flat: I jacked the car up and put the spare on.. and continued working on the planned o2 sensor changes on Sunday. Yesterday I took the car and tire to Americas Tire since I bought the tires (and replacement certs) from them. They ended up replacing the tire for free, so I just had to pay the CA environmental tax, and a new certificate. I also opted to purchase a second new tire to have a "matched" set of tread since the other tires are at about 4-5 32nds of tread left. I hope I'm done spending money on this car for awhile, but it is the wife's car... It is comfortable, safe and is relatively inexpensive to drive - less than a new car payment every month, and safe for her and the kids to run around in.
_________________________
'06 Focus SES 2.0 93,487 QSUD 5w30
'04 Highlander 2.4 157,521 Maxlife 5w30
"God is Great, Beer is Good, and People are Crazy." USA

Top
#3228625 - 12/26/13 07:40 PM Re: P0420 Code... CAT or O2 sensors? [Re: MysticGold04]
mitmaks Offline


Registered: 10/09/11
Posts: 13
Loc: WA
I was wondering if replacing o2 sensors fixed your issue?

Top
Page 4 of 4 < 1 2 3 4