When you have no cats...
- Thread starter MouTine
- Start date
do you have a tune... or MIL Elim's?
I think I remember the P0156 on my car, it was caused by not having cats. Instead of MIL's I used the spark plug non-foulers, works great and no more CEL.
PO420 and PO430 are the codes it will throw
Well then... Why I'm getting P0156? I'm also getting punch of other codes... Sh... I'm so fed up with this car at the moment!
Does it matter if i clear codes with scanner or unplug battery lead? Is there diffirence? Can some codes still be in memory?
Does it matter if i clear codes with scanner or unplug battery lead? Is there diffirence? Can some codes still be in memory?
I had the P0420. The P0156 later came on, I put in the non-foulers, and both went away. That's all I know.
what are the other codes the one 156 is usually a bad o2
Heres the definition for P0156.
Number P0156
Type Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description: HO2S No Activity Circuit Conditions
Location Bank 2 Sensor 2
Cause Engine running in closed loop for 5 minutes, then the PCM detected that the HO2S failed the maximum or minimum voltage range check (middle signal out-of-range)
It should be caused by the cats.
Number P0156
Type Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description: HO2S No Activity Circuit Conditions
Location Bank 2 Sensor 2
Cause Engine running in closed loop for 5 minutes, then the PCM detected that the HO2S failed the maximum or minimum voltage range check (middle signal out-of-range)
It should be caused by the cats.
without cats the rear o2 will read more like the front o2s in which case would throw a 420-430 that code explains that the o2 did not switch enough during the allotted time period, which means it was stuck in the middle which means no cats had nothing to with it. the car has an unplugged o2, bad wiring , contaminated sensor element, or malfunctioning heater circuit, which is inside the o2
I have allmost all codes related to emission stuff b/c I have removed them. P1443, 0411, 0401, 0000, 0153... What a smart idea... Today or tomorrow I'm going to put SAI back working. Hope then I could kill atleast one code. I have ordered new purge valve and flow sensor for EVAP system and vacum electric valve for EGR. They should be here within few weeks.
Front 02 sensors are only one 'n half year old and these new ones are original Ford / NTK service parts. Rear sensors are original I think...
I'm feeling I'm missing about 20hp. I couldn't eaven reach 100mph trapspeed at quartermile run. And I have posted few topics to figure out why my timeing start to jump up 'n down sharply after 4500rpm.
Killer hangover again...
Front 02 sensors are only one 'n half year old and these new ones are original Ford / NTK service parts. Rear sensors are original I think...
I'm feeling I'm missing about 20hp. I couldn't eaven reach 100mph trapspeed at quartermile run. And I have posted few topics to figure out why my timeing start to jump up 'n down sharply after 4500rpm.
Killer hangover again...
Know I haven't posted much, and not sure if it helps...but...i was throwing a 1443, 0430, 0420...replaced the purge valve and they all haven't come back...might just wanna try that first
Installed the SAI system back. Looks like it working well. Will se that later... Who ever put that new air pump before my ownership he wasn't very pro. That rubber dust plug was there in inletport. No wonder it didn't work in the first place.
Somethig is wrong with the EGR electric valve. I can breath both ways tru that valve. It's totaly open. Nothing happens if I plug it into car wireing. I tested that full 13-14v are suplied to plug. I allso tested ohm rate of that valve and there is 30 ohm. So electricaly it's ok, but I think valve is just stuck open.
Somethig is wrong with the EGR electric valve. I can breath both ways tru that valve. It's totaly open. Nothing happens if I plug it into car wireing. I tested that full 13-14v are suplied to plug. I allso tested ohm rate of that valve and there is 30 ohm. So electricaly it's ok, but I think valve is just stuck open.
Yes thats true. But this code is also set when it stays in closed loop for 5 min or more after start up. Since there are no cats to "light off" the downstreem o2's stay flat lined matching the upstreem's in closed loop. This "can" be caused by the cats. Not saying that the o2's are not the problem. But since you need the non foulers or whatever trick for the o2's anyways, see if it goes away before you replace o2 sensors.
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