Test pipe nightmares
#1
Test pipe nightmares
hopefully some body here can set me straight, and i (we) can figure this out...
i had an SES light coming on and off. it was the P0420 code. i figured cats were starting to clog. pretty sure i was right.
installed test pipes on my car about 5 days ago. i have an 04 ( must be an 04.5 because SES light is driving me nuts) g35 coupe.
test pipes had no shielding for downstream O2's. so i put in some 18mm antifoulers, thinking that would do the trick for the SES light that i knew would be coming on soon otherwise.
no SES light for 2 days or so. driven about 50mi a day.
came on, i checked the codes and cleared them. P1167, it turned up twice. Heated Rear Oxygen Sensor 2 Maximum Voltage Monitoring Bank 2. and then showing "sending" inside the code description or something like that.
no codes for about a day and 1/2, then came back on, checked it, P1283 now. Air fuel ratio (A/F) sensor 1 (Bank 2) lean shift monitoring
im not really sure what is causing the codes at this point. i have ruled out plenum leak.
im considering:
PCV valve
ECU needs hard reset (pull 2 fuses for 10 min)
maybe injectors need cleaned?
Loose connection to downstream O2's
exhaust leak either between header/test pipe or test pipe/ypipe
antifoulers are not working.
I'm thinking its one or more of the last 3....
so if it is the antifoulers are not going to work, i was going to wire in some resistors to my downstream O2's to make them give ECU a desirable reading to clear CEL light. BUT! i am not 100% certain i know exactly how to emissions system worked on this car. i do not want to install resistors and permanently throw my A/F ratio wayyyy off.
so anyone know how the O2's read collectively? i always thought the upstreams read A/F and the down streams read for the emissions control?
if that was the case couldn't i just capp of my antifoulers over the downstream O2's and fix it? but, a friend has and A/F gauge in his 03 sedan, and he tied it into the downstream O2?
also, bank two (for the DTC codes) which sensor would that be?
i had an SES light coming on and off. it was the P0420 code. i figured cats were starting to clog. pretty sure i was right.
installed test pipes on my car about 5 days ago. i have an 04 ( must be an 04.5 because SES light is driving me nuts) g35 coupe.
test pipes had no shielding for downstream O2's. so i put in some 18mm antifoulers, thinking that would do the trick for the SES light that i knew would be coming on soon otherwise.
no SES light for 2 days or so. driven about 50mi a day.
came on, i checked the codes and cleared them. P1167, it turned up twice. Heated Rear Oxygen Sensor 2 Maximum Voltage Monitoring Bank 2. and then showing "sending" inside the code description or something like that.
no codes for about a day and 1/2, then came back on, checked it, P1283 now. Air fuel ratio (A/F) sensor 1 (Bank 2) lean shift monitoring
im not really sure what is causing the codes at this point. i have ruled out plenum leak.
im considering:
PCV valve
ECU needs hard reset (pull 2 fuses for 10 min)
maybe injectors need cleaned?
Loose connection to downstream O2's
exhaust leak either between header/test pipe or test pipe/ypipe
antifoulers are not working.
I'm thinking its one or more of the last 3....
so if it is the antifoulers are not going to work, i was going to wire in some resistors to my downstream O2's to make them give ECU a desirable reading to clear CEL light. BUT! i am not 100% certain i know exactly how to emissions system worked on this car. i do not want to install resistors and permanently throw my A/F ratio wayyyy off.
so anyone know how the O2's read collectively? i always thought the upstreams read A/F and the down streams read for the emissions control?
if that was the case couldn't i just capp of my antifoulers over the downstream O2's and fix it? but, a friend has and A/F gauge in his 03 sedan, and he tied it into the downstream O2?
also, bank two (for the DTC codes) which sensor would that be?
#3
#5
Registered User
iTrader: (10)
Begin by cleaning the sensors in bank 2 (passenger side) and make sure you have no leaks in the connections. I replaced sensor #2 throwing the same code in the passenger side a week after in installed my HFCs and it never came back. My next issue shortly after was a lean condition due to all my breather mods requiring a tune to correct!
Gary
Gary
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