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1999 Audi A4 A4 help

Tiny
JAHJAH
  • MEMBER
  • 1999 AUDI A4
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
I have a 1999 a4 1.8T Quattro and lately it just drive like a piece of crap. The car shakes really bad when the weather is above 90 degrees both when being driven and when it is idle. Engine check light came on and reads the following codes-
P0300-Random /multiple cylinder, isfire detected
P0303 Cylinder 3 Misfire detected
P0304-Cylinder 4 Misfire detected
P0302 Cylinder 2 Misfire detected
P0422 Main Catalyst Below Threshold (Bank 1)
P1300-Manfacturer Contrl. Ignition System or Misfire

If anyone could please help me with these codes so perhaps I can fix them by myself. Thanks
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Tuesday, July 15th, 2008 AT 12:30 AM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

The first thing to do I sort out the miss fire, check plugs, leads, coil, injectors, may be start with a full tune and clear the codes, run the engine and re scan to see if you have eliminated any of the miss fire codes. Start here.

Mark (mhpautos)
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Tuesday, July 15th, 2008 AT 1:20 AM
Tiny
RJJ 1
  • MEMBER
  • 16 POSTS
You need to replace the coils on affected cylinders with misfires, on the cat below threshhold fault have the fault cleared if it returns you need to replace the cat. The misfires have probably destroyed the cat
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Saturday, July 26th, 2008 AT 11:41 PM

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