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Old 01-08-2008, 10:15 PM   #1
Minorityairsoft
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Default Cracked Cylinder Head

I had my block replaced due to a thrown rod, by SUBARU. 8,000 miles later I now have a cracked head. Subaru scanned my car and revealed that I had a PO171 code, Exhaust running lean, and a PO546 code, Exhaust temperature sensor. I have a cat before the sensor. My question is, can either of these codes lead to a cracked head in any way? My theory is that the exhaust running lean code is because the engine is lean causing extreme temperatures in my engine which explains the exhaust temp code. Extreme temperatures cause cracked head?
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Old 01-08-2008, 10:27 PM   #2
Haelan
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Detonation from too lean of an air/fuel mixture probably cracked your head--much higher explosive force than normal. But you're right, that detonation causes much higher exhaust gas temps. If it was running extremely lean for awhile it could have burned up your EGT probe causing the P0546.
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Old 01-08-2008, 10:50 PM   #3
surowrxa
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Quote:
Originally Posted by Minorityairsoft View Post
I had my block replaced due to a thrown rod, by SUBARU. 8,000 miles later I now have a cracked head. Subaru scanned my car and revealed that I had a PO171 code, Exhaust running lean, and a PO546 code, Exhaust temperature sensor.
Are you saying you did not have a CEL come on?

What year/miles of car please.
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Old 01-08-2008, 11:34 PM   #4
Minorityairsoft
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2002 Wrx, 88,000 mi.

Last edited by Minorityairsoft; 01-08-2008 at 11:48 PM.
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Old 01-08-2008, 11:37 PM   #5
Minorityairsoft
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2002 Wrx, 88,000 mi.
I had the cel on and went to the dealership and they told me about two codes,exhaust temp and a MAF code due to my aftrmkt cai, and it was prolly just a dirty sensor. My MAF code went away. Basically telling me nothing to much to worry about and i went along with my business keeping that in the back of my head as something to fix. Then i took my car back in after cracking the head where they told me i had another code that was an exhaust lean warning. All of this was after the dealership installed my new block. There were no CEL's before they replaced my block.
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Old 01-09-2008, 10:07 AM   #6
surowrxa
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Originally Posted by Minorityairsoft View Post
2002 Wrx, 88,000 mi.
I had the cel on and went to the dealership and they told me about two codes,exhaust temp and a MAF code due to my aftrmkt cai, and it was prolly just a dirty sensor. My MAF code went away. Basically telling me nothing to much to worry about and i went along with my business keeping that in the back of my head as something to fix. Then i took my car back in after cracking the head where they told me i had another code that was an exhaust lean warning. All of this was after the dealership installed my new block. There were no CEL's before they replaced my block.
Ah, I see. You did not know about the PO171 because the light was on for other codes previous. That sucks, because that's a code/problem you wouldn't be driving around with.
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