Bank 2 Plugs are all foul(black)

2

2000 DiscoIowa

Member
Mar 9, 2006
14
0
my '01 disco ii (145,000 miles) recently began idling rough and SES light came on. initial codes read:

p1590 (idle speed)
p0150 (o2 sensor, bank 2)
p0174 (sys too lean, bank 2)
p1174 (fuel air metering)
p0112 (IAT sensor 1, low input)
p0102 (MAF)
p1129 (fuel air metering)

i got a new MAF, still no better. so i took the plugs out and found all the passenger-side plugs are black and driver-side look good. i put in new plugs (drove GREAT at start), drove about 20 miles and took out a plug from each side. driver-side is still good, passenger-side is once again black. i haven't had the codes read again yet, since being reset after i installed the new MAF. any ideas of what could be causing this?

thanks,
mark
 
2

2000 DiscoIowa

Member
Mar 9, 2006
14
0
that makes sense. i found this on RAVE:

"In the event of a HO2S failure any of the following symptoms may be observed: Default to open loop fuelling on defective bank ...performance will become progressively worse as the sensors go towards maximum rich for one bank of cylinders and maximum lean for the other. The ECM will eventually default into open loop fuelling."

any recommendations on where to purchase o2 sensors?
 
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