Po171 & Po174
Once again with codes. So far I have changed the O2 Sensors, air, oil and fuel filter, EGR and sensor and the plugs. These codes just started to show up after the filters were changed, but I have gone through the vacume hoses for leaks - nothing. I see whrere the MAS could cause this but are there any other ideas? Would the internal ports for the EGR system throw these codes?
The van seems to run great, but I haven't checked what the MPG has been.