Faulty 02 Sensors - TECHNICAL UPDATE!! (pg.5)
- Thread starter StevenH72
- Start date
Liverpool
i have 4 brand new spares sat in my parts hoard, i had a post cat fail but once reset and new battery was installed the code never came back, as it was link to the heater circuit i think my failing battery was playing havoc with the cars systems....
POST cat sensors are only checking cat efficiency and are narrow band sensors, this doesn't effect engine performance at all, pre cat needs the car to be driven gently and replaced immediately, these are wideband and are used for fuel trims etc.
POST cat sensors are only checking cat efficiency and are narrow band sensors, this doesn't effect engine performance at all, pre cat needs the car to be driven gently and replaced immediately, these are wideband and are used for fuel trims etc.
So the pre cat sensor has been replaced picked her up after work, the car was immediately lumpy and within 2 miles the exhaust emissions light came back on.
The only other thing that showed up on the diagnostic was the post cat sensor.
But as Beedub has said it shouldn't affect the running.
So what else could it be? Coil packs? Throttle sensor?
The only other thing that showed up on the diagnostic was the post cat sensor.
But as Beedub has said it shouldn't affect the running.
So what else could it be? Coil packs? Throttle sensor?
Define lumpy.
post cat will definitely not effect the running of the car, they are are narrow band sensor , they are checking for cat efficiency only... ( basically that the cats are operational) most aftermarket tunes actually delete them so they are basically not in ready state .
Ah. Acceleration: and is there a limit to the speed you can get to?
StevenH72 said:
If not O2 sensors, how about coil pack? On my Zed, what happened drive wise was I definitely noticed acceleration was staggered, when I had foot applied with constant pressure the speed increase wasn't smooth. That's when I knew something wasn't right. Then it seemed to get to about 50 - 50 mph maxing out. I didn't drive it much and went straight to the Indy I think, so sorry can't comment on when the engine was warm. I drove quite sensibly as woulda been early morning traffic. It was coil pack No. 5 that needed changing. The coil pack was quite a cheap fix - one pack plus a little labour. IIRC the part was around £30 - £35. No more than that. It is a common issue. Could there be two probs hence the problem still present after fix number 1. Sent you a PM with info incase it helps.
Mine was doing exactly as you describe Steven and then the exhaust emission light came on. I thought coil pack, idle-control valve or TPS but they diagnosed the wiring for the O2 sensor had rubbed through against the engine block on bank 2 (pre-cat I think?) and the sensor had failed. They replaced under warranty and the car is now faultless since. Aren't there two pre-cat and post-cat sensors? Could it be your other pre-cat one has failed too?