Question about 2000 Ford Expedition
P0136, P1131, and P1151 code readings on my ford 2000 expedition 4.6L. Heater core had gone bad recently and has been corrected but now the engine runs rough when idling at stop light, otherwise runs smooth good. I have read this might be the O2 sensor bank 1, but others have mentioned this is coil pack related... Any assistance would be much appreciated.
Your auto has four O2 sensors. Two upstream and two downstream; With two banks. Bank 1, sensor 1...and bank 2, sensor 1 are the two upstream (exhaust manifold before the catalytic). Bank 1, sensor 2 and bank 2, sensor 2 (other side of catalytic)
Code 1131= upstream; bank 1..sensor 1
Code 1151= upstream; bank 2..sensor 1
Code P0136 (generic code) bank 1..sensor 2 (questionable)
I wouldn't spend the money to purchase 3 sensors. Highly unlikely all three are bad; Cost is about $40/ ea.
Since there isn't a code for the cat's themselves, I would suspect the O2 circuit is malfunctioning. The rough idle is another clue.
Take an ohmmeter set it on X10 scale and measure the resistance from engine to body and body to negative post on battery terminal. You should read zero ohms (full needle deflection). If you do go buy two upstream O2 sensors. If you read
open or a high resistance run two straps from eng. to body...and body to neg.batt. post.
Posted on Dec 10, 2009
If it began after u replaced the heater core check ur sparkplug wire boots / sockets and plugs u may have got them wet if so dry everything out and replace wires worked for me. pull out plug wires closest to heater core and check for moister or coolant
Posted on Feb 19, 2011
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Posted on Jan 02, 2017
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