SOURCE: 1997 nissan altima has no spark at the plugs.
get those sensors connected to the output of the module tested cause its ruining the module
SOURCE: Check Engine code P1409
clean the egr valve port on intake use piece of clothes rack clean the built up carbon on inside of port.
SOURCE: Code P0401 toyota Camry 3.0 v6
replace the vsv that has the vacuuum hose running from it to the egr valve
SOURCE: EGR Valve, O2 Sensor
Absolutely a bad o2 sensor can cause problems with performance. If you replace one it is highly recommended to replace both or all four depending on your vehicle. If one o2 sensor is making your vehicle run rich you will burn more fuel and in return increase the amount of carbon or unburnt fuel if you will in your egr valve you could probably get away with cleaning it but I would recommend replacing it, it will save you from having to pull it off again. Check your catyletic converter because long exposure to carbon will mess it up.
SOURCE: 2002 Ford Escape (V6) P0401 P0402 nightmare
Sounds like you have a vacuum leak, a problem with the wiring, or a bad PCM. Check wiring for pinched, chafed, pierced, or broken wires. Make sure vacuum supply is good, and not collapsing when the vehicle is running. Beyond that, a trip to the dealer may be in order.
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