Well the P0420, catalytic converter bank #1 just came on Tuesday again. LTFTs still above 10% positive. The data is shown below. This is with the Vararam, power duct, Halltech screen and the MAF set at original factory placement. Any ideas are appreciated. Thank you.

Control Module
$10 SAE J1850 VPW
Stored Codes
P0420 Catalyst System Efficiency Below Threshold Bank 1


Control Module
$10 SAE J1850 VPW
Vehicle Info.
Not Supported Or Sto-red No Data.
Since DTCs Cleared
MIL Status ON
Misfire Monitor OK
Fuel System Mon OK
Comp. Component OK
Catalyst Mon OK
Htd Catalyst N/A
Evap System Mon OK
Sec Air System OK
A/C Refrig Mon N/A
Oxygen Sens Mon OK
Oxygen Sens Htr OK
EGR System N/A
Stored Codes
P0420 Catalyst System Efficiency Below Threshold Bank 1
Pending Codes
P0420 Catalyst System Efficiency Below Threshold Bank 1
View Freeze Frame
DTCFRZF P0420
FUELSYS1 OL-Drive
FUELSYS2 OL-Drive
LOAD_PCT(%) 2.0
ETC(°C) 196
SHRTFT1(%) 0.8
LONGFT1(%) 14.1
SHRTFT2(%) 0.8
LONGFT2(%) 13.3
MAP(kPa) 10.9
RPM(/min) 553
VSS(km/h) 0
MAF(g/s) 0.708
TP(%) 3.9
O2 Monitor Test
Not Supported Or Sto-red No Data.
On-Board Mon. Test
Test $02 Data
ID : 04
MOD : $10
MEAS: 0
MAX : -----
MIN : 0
STS : OK
------------------
ID : 66
MOD : $10
MEAS: 8009
MAX : 8046
MIN : -----
STS : OK
------------------
ID : 36
MOD : $10
MEAS: 0
MAX : 28
MIN : -----
STS : OK
------------------
ID : 06
MOD : $10
MEAS: 8064
MAX : -----
MIN : 8064
STS : OK
------------------
ID : 50
MOD : $10
MEAS: 805A
MAX : -----
MIN : 805A
STS : OK
------------------
ID : 60
MOD : $10
MEAS: 8006
MAX : 80B4
MIN : -----
STS : OK
------------------
ID : 30
MOD : $10
MEAS: 0
MAX : -----
MIN : 0
STS : OK
------------------
ID : 40
MOD : $10
MEAS: 0
MAX : -----
MIN : 0
STS : OK
------------------
ID : 52
MOD : $10
MEAS: 8000
MAX : 8000
MIN : -----
STS : OK
------------------
ID : 11
MOD : $10
MEAS: 178
MAX : -----
MIN : 177
STS : OK
------------------
ID : 21
MOD : $10
MEAS: 0
MAX : 7D0
MIN : -----
STS : OK
------------------
ID : 71
MOD : $10
MEAS: 8009
MAX : 8078
MIN : -----
STS : OK
------------------
Test $03 Data
ID : 01
MOD : $10
MEAS: 0
MAX : 3
MIN : -----
STS : OK
------------------
ID : 02
MOD : $10
MEAS: 0
MAX : 3
MIN : -----
STS : OK
------------------
Test $05 Data
ID : 0A
MOD : $10
MEAS: 18A
MAX : 5AA
MIN : -----
STS : OK
------------------
ID : 4A
MOD : $10
MEAS: 137
MAX : 5AA
MIN : -----
STS : OK
------------------
Test $06 Data
ID : 35
MOD : $10
MEAS: 24
MAX : 85
MIN : -----
STS : OK
------------------
ID : 41
MOD : $10
MEAS: 27
MAX : 92
MIN : -----
STS : OK
------------------
ID : 55
MOD : $10
MEAS: 2A
MAX : 87
MIN : -----
STS : OK
------------------
ID : 61
MOD : $10
MEAS: 27
MAX : 92
MIN : -----
STS : OK
------------------
Test $0C Data
ID : 60
MOD : $10
MEAS: 818B
MAX : 8000
MIN : -----
STS : Fail
------------------
ID : 70
MOD : $10
MEAS: 75D8
MAX : 80F9
MIN : -----
STS : OK
------------------

 

I am still tripping P0420 codes. sent information to Vararam but no response yet. LTFTs are still out there at 112-15%

 

Did you ever figure this out?

 

I purchased a Diablosport Predator tuner and readjusted the long term fuel trims with power duct and the repositioned MAF. I had to change the LTFTs during shoulder months for spring to summer and summer to fall, but seemed to work okay. I received a good buy on a Grand Sport and traded the C5 end of 2010.

 

I installed the Vararam and new bridge on my '03 a while back. I remember reading that if you have lean codes after install, then repositon the MAF to it' s original location next to the air filter. That's how I did the install and have had no codes so far. The PO 420 is indicative of the car needing a new Catalytic convertor, nothing to do with the Vararam install. Hope this helps.

 

Understand the 0430 code, but that only relates to the efficiency of the catalytic convertor as measured by the oxygen sensors. The oxygen sensors did test out good but I could cahange the DTG just by moving the MAF. At air cleaner LTFTs were high (>22%) and locating MAF at throttlebody the ctalytic converter code would trip. Prior in the write-up I shared a conversation with Vararam and there thoughts that the catalyst bed was blinded due to excess fuel.