Check Engine Light and codes question
Thread Starter
Racer
Joined: May 2014
Posts: 361
Likes: 34
From: Central MA
Check Engine Light and codes question
Today for the first time my check engine light came on and stayed on. I read the codes and P0171 H P0174 H are only codes listed. They are fuel trim system lean banks 1 and 2 respectively. The check engine light returns on successive restarts. I assume these codes are the cause but not sure if perhaps something else is going on. The car seems to drive normally. Earlier today I had the A/C belt replaced during which the main drive belt was removed. I had driven the car home and went out to dinner and then after the light came on. Any advice appreciated.
Thread Starter
Racer
Joined: May 2014
Posts: 361
Likes: 34
From: Central MA
Lean banks 1 and 2. MOST likely cause of these two codes together is an air leak after the MAF.
Check the air plumbing between the MAF and TB for loose clamps, cracks in the rubber couplings etc
Also check out the hoses for the PCV system. Over time they rot and also allow unmetered air into the system which causes the lean codes on both banks..
Check the air plumbing between the MAF and TB for loose clamps, cracks in the rubber couplings etc
Also check out the hoses for the PCV system. Over time they rot and also allow unmetered air into the system which causes the lean codes on both banks..
