So I had AutoZone check with a code reader. They said it was a P0300. Should I take to the dealer or ?

Asked by Jul 31, 2012 at 02:17 PM about the 1997 Mazda MX-5 Miata Base

Question type: Maintenance & Repair

They said it could be The folowing...
Lean air/fuel ratio, week ignition system,engine mechanical condition, vacuumleak effecting one cylinder.
That was the print out they gave me. What to check first.

3 Answers

292,545

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires. Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors. Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

2 people found this helpful.
835

^ Exactly, if you are mechanically inclined it may be a good idea to tear into it a little and start replacing the vacuum lines on the car. possibly even a tune up too. probably be less than 175 for a full tune up and vacuum lines. just remember have good diagrams or take pictures if you feel unsure!

1 people found this helpful.
250

The 03 codes also include o2 sensor if im not mistaken. Most likely a bad o2 sensor...

1 people found this helpful.

Your Answer:

MX-5 Miata

Looking for a Used MX-5 Miata in your area?

CarGurus has 4,612 nationwide MX-5 Miata listings starting at $1,900.

ZIP:

Mazda MX-5 Miata Experts

  • #1
    Michael Kane
    Reputation
    2,210
  • #2
    Tom Demyan
    Reputation
    1,280
  • #3
    Racer_X
    Reputation
    410
View All

Related Models For Sale

Used Ford Mustang
273 Great Deals out of 37,582 listings starting at $1,350
Used Chevrolet Corvette
81 Great Deals out of 15,015 listings starting at $3,620
Used Chevrolet Camaro
229 Great Deals out of 27,305 listings starting at $2,800
Used Honda Civic
352 Great Deals out of 49,702 listings starting at $1,499
Used BMW 3 Series
826 Great Deals out of 31,377 listings starting at $900
Used Porsche Boxster
14 Great Deals out of 1,069 listings starting at $3,495
Used Jeep Wrangler
225 Great Deals out of 16,773 listings starting at $3,000

Used Cars For Sale

2018 Mazda MX-5 Miata For Sale
2,060 listings starting at $24,410
2017 Mazda MX-5 Miata For Sale
5 Great Deals out of 1,014 listings starting at $19,965
2016 Mazda MX-5 Miata For Sale
324 listings starting at $15,599
2015 Mazda MX-5 Miata For Sale
4 Great Deals out of 109 listings starting at $13,495
2014 Mazda MX-5 Miata For Sale
4 Great Deals out of 51 listings starting at $12,817

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.