All,
My 1998 S70 has just recently thrown a P0172B code, with a pending P0301B code, and from what I can tell while driving it, I notice nothing out of the ordinary.
The car was purchased in 2016 with around 125k to 130k on the clock. It is now reading 155k. I’ll have to check my records to verify for sure.
I’ve only visually checked all of the vacuum lines to date, nothing else. Before I get into what I plan to do, does anyone know how many drive cycles are needed to set the CEL once I’ve cleared it, if in fact I have not fixed the problem?
What I plan to check is as follow(s), hopefully least expensive to more expensive:
- Smoke the system to check for vacuum leaks, fix as required, (replaced the PCV system in 2016, so it should be good),
- Spray brake cleaner on the fuel injectors while the car is idling to see if I have a leak there, replace o-rings as necessary.
- Inspect the spark plugs, though I don’t think this is the problem as they were replaced after I purchased the car.
- Inspect and clean MAF with CRC MAF cleaner. Car does not stumble at idle, so I think I might be able to rule this out as a possible bad MAF, though I will clean it.
- Test current ECT and compare with new ECT, replace if bad. So a question here, how do I know if it’s bad? What resistance value or range should it have?
- Check for faulty Thermostat, flush system while it open because it’s time to flush it, and replace the thermostat if it’s bad. I don’t suspect this to be bad as its only 2 years old, but one never knows.
- Check fuel pressure, if in spec move on, if not, replace regulator with new one. What PSIs should I be seeing if the current regulator is operating correctly?
- Finally inspect, and test the O2 sensors, replace if bad. How do I go about testing these to determine if they are bad?
So does this sound like a good plan of attack? Have I left anything out that I should be looking at?
Thanks in advance,
Matt