S-Type / S type R Supercharged V8 ( X200 ) 1999 - 2008 2001 - 2009
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S Type Bank 1 too lean

 
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Old 12-19-2018, 02:08 PM
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Default S Type Bank 1 too lean

I have a 2003 S Type R. Fault code is P0171, bank 1 too lean. The "reduced performance" signal comes and goes intermittently. I am guessing an air filter, MAF or vacuum leak issue would also yield a P0174 for bank 2 as well. I am thinking a bad O2 sensor, does that sound reasonable? (I would think that would be a code as well). I seem to recall a couple of years ago the car was scanned and there was some issue with O2. I think bank 1 is passenger side-correct? Also, is it hard to change that sensor, any guidance in that regard is welcome....

Fred Emmerich
 
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Old 12-19-2018, 02:44 PM
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Do you have a way to read fuel trims and also the O2 sensor values. That would help immensely
 
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Old 12-19-2018, 03:42 PM
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+1 read fuel trims - much cheaper than parts-swapping and much more likely to provide some useful data.

Hot engine, parked. At idle, then rev to about 2500.
 
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Old 12-19-2018, 07:14 PM
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Check the PCV mount and hose to the throttle body for cracking.
 
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Old 12-19-2018, 10:43 PM
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Originally Posted by JagV8 View Post
+1 read fuel trims - much cheaper than parts-swapping and much more likely to provide some useful data.

Hot engine, parked. At idle, then rev to about 2500.
You know who I learned the value of fuel trims from right jagv8....a hint....username is in this post
 
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Old 12-20-2018, 09:11 AM
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Originally Posted by scottjh9 View Post
Do you have a way to read fuel trims and also the O2 sensor values. That would help immensely
Not sure, I have a simple bluetooth reader.
 
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Old 12-20-2018, 10:07 AM
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What software are you using, it should probably be able to see fuel trims.
 
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Old 12-21-2018, 02:40 PM
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Torque Pro
 
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Old 01-03-2019, 03:01 PM
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Bank 1 LT = 18.8 ST = 0.8%
Bank 2 LT = 14.8% ST = 3.1%

I have seen where you want the short term to be around zero, and LT a bit higher. I am not sure what LT should be though.
 
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Old 01-03-2019, 03:21 PM
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Read them with hot engine, parked.

At idle, then rev to about 2500 and read again.

ST should be small and can usually be ignored. LT should be within (say) 5 of 0.

We can see your LTFTs are big. If they drop when revved you have an air leak... but do they?
 
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Old 01-04-2019, 01:10 PM
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LT for both banks is 17.2 at idle, drops to 14 at 2500RPM. ST stays the same, around 0-3%
 
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Old 01-04-2019, 02:51 PM
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I cleaned the MAF sensor and air filter, idle is now 16 (down from 17.2) for LT and 3 (up from 1) for ST. No check engine light yet.
 
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Old 01-04-2019, 02:52 PM
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That's hardly any drop so you're probably looking at something other than an air leak.

That leaves the rest of the list in the workshop manual / codes PDF. Free to download off this site or JagRepair.com - Jaguar Repair Information Resource

I'd clean the MAF (with great care) and if not recently done change the fuel filter.
 
 
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