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unable to answer since each state has different laws and rules governing their inspection emissions testing -also if oil is being burnt will change and usually fail an emissions test in most states --have vehicle scanned just scanned and check for any codes and emissions readiness- also check oil level and condition may simple need an oil change --
I'm going to guess you do No Preventative
Maintenance what so ever, or know what is needed
The Oxygen Sensors get replaced at 100,000 miles
or when they fail or when their switching times & data
are not as it should be
Spark Plugs-every 3 years
It costs money to work on a vehicle to learn how things are
& collect needed data, when it appears to get you places
with no issues,then you have problems & lots of them & no
record of when it did work correctly
O2 Sensors are big part of fuel trim-- IF-- you have no vacuum
leaks or cylinder misifres
An old blocked exhaust converter can be a problem
I would:
Replace the spark plugs
Replace all O2 Sensors
Clean the MAF Sensor
Replace any cat over 12 years
Check Fuel Trim
Check to see all 8 Emission Monitors run-- on a long 25
mile road test-after other work is caught up
EGR -issues
Exhaust Leaks before converter
Evap System-Leaks
Have to check & test it all-the entire vehicle
BEFORE -you replace the cat
There may not be much you can do yourself without the proper equipment.
Code 170 means the computer is not able to control fuel mixture on bank one. There are several possible causes including injectors and air restrictions. You would probably need a scanner to monitor the O2 and MAF sensors to try to find the problem.
Year make and model ? Code 170 is for a lean or rich fuel mixture on bank one. Code 301 is for a miss on cylinder one which could be fuel, ignition, or something mechanical. Code 1174 depends on the vehicle.
needs a new speed sensor or the drive gear wheel has broke ,nothing difficult about this its on top of the passenger side drive shaft differential unit
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