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Posted on Jan 02, 2017
SOURCE: PO137, PO 138 codes
well on my car these are reffering to the sensors in the exhaust, the upstream sensor(before the cat) and the downstream sensor(after the cat) the downstream sensor can act up if it is lazy or sluggish, or due to a bad catalytic converter or a clogged one. however there are sensors on the exhaust manifold which are determined by driver side or passenger,my opinion is to get a scanner for about $100 to $150 and you can figure out many of these codes yourself.
Posted on Sep 19, 2008
bank 1 is the bank that number 1 cylinder is located (any engine, not just Ford) passeger side
Posted on Sep 05, 2011
Testimonial: "Yes, I was aware of the spark plug thing, but I don't have the firing order.Thanks,though, because you and the other answer seem to be conclusive. "
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