After the EGR is fixed, the other codes will clear up because they have to do with the catalytic converter and the oxygen sensors. The vaccum leak affects those readings.
Vehicles do not throw codes, they are displayed on scanner. You keyboard does not throw characters at monitor screen, they are displayed. Whomever gave you codes should have told you what they meant. Anyone can buy a $19.00 scanner but even it comes with code meaning. All vehicles sold in North America use OBD 2
codes. the port is the same located in the same place,. You can search for free by typing code followed by number.
https://www.autocodes.com/p1410.html
https://www.engine-codes.com/p0171_mazda.html
https://www.autocodes.com/p0174_mazda.html
https://www.yourmechanic.com/article/p0421-obd-ii-trouble-code-warm-up-catalyst-efficiency-below-threshold-bank-1-by-andrew-quinn
https://www.yourmechanic.com/article/p0431-obd-ii-trouble-code-p0431-warm-up-catalyst-efficiency-below-threshold-bank-2-by-conor-fynes
Start with the first code, most likely is causing the other codes. P1410 EGR Boost Solenoid Valve Stuck needs to be replaced. It's causing a vacuum leak.
SOURCE: have 2002 vue with po421,po431,po171,po174
Okay, both catalytics are not operating efficiently, especially during warmup. Those are Codes 421 and 431.
The other 2 Codes are for lean mixtures on both banks. This means the engine is going to try to enrichen the fuel mix to compensate for the lean condition.
This is creating a problem in the catalytics as more fuel is dumping into the engine.
Once you find the source of the lean mix, the catalytics have the ability to heal or burn off the excess over time if they are not damaged.
Usually, a loose or bad fit on the Intake manifold gasket is the problem. Using a spray bottle of water, with the engine running, lightly mist the seams of the intake. Continue to vacuum fittings, vacuum lines, and on the intake manifold itself.
You should find a problem when the engine RPM changes or stalls. Then fix the leak you have found.
Other than this test, only a better scanner can help you. The most expensive scanners have an Algorithm which predicts, in order of importance, the most likely bad part. Go to a repair shop for this diagnosis, then decide if it is easier to pay them to fix it or do it yourself.
With the best scanners, you will have to pay for the diagnosis.
Autozone, Advance, and Oreilys, give free scans. You would have to call to find out if their scanner can make parts predictions.
I suspect it is a problem in the main throttle, air horn area since both sides of the motor are having the same problem.
I hope this helps you.
Hi
Please check the link to get a detailed idea about the code:-
http://www.obd-codes.com/p0421
Please get back to us if you have further query else please accept the suggestion.
Thank you for contacting fixya.com
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