Random misfire and codes P0300, P0303 and P0304

2012 VOLKSWAGEN TIGUAN
74,000 MILES • 2.0L • 4 CYL • TURBO • 2WD • AUTOMATIC
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MILINTHOSANI
  • MEMBER
  • 1 POST
I am getting P0300 P0303 and P0304 error codes.
I changed all the spark plugs and Ignition coils. Still I see the same problem. Please help.
Jul 31, 2020 at 11:26 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

These codes can be the result of a few things. Engine vacuum leaks, fuel pressure, along with other things can cause them.

Since the vehicle only had 74,000 on it, I can't imagine it is a compression issue. So, lets start by checking to see if there are any leaks that could be causing it. Here is a link that explains how to check for engine vacuum leaks:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Also, make sure the air induction tube between the air box and the throttle body is properly installed.

Let me know what you find

Joe
Jul 31, 2020 at 3:15 PM
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