DTC's

1183 Views 4 Replies 3 Participants Last post by BUGSTUFF, Aug 19, 2014

BUGSTUFF

Discussion Starter · Jul 21, 2014

DTC's:
16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean
16824/P0440/001088 - EVAP Emission Control Sys: Malfunction
16486/P0102/000258 - Mass Air Flow Sensor (MAF/G70): Signal too Low

'98 2.0. Car runs better when the CEL is illuminated. It was diffucult to start after I erased the codes and it smells like it is running rich. I'm thinking that a bad MAF may be causing all 3, but there is no change in how it runs if I unplug it.
Thoughts???

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billymade

· #2 · Jul 21, 2014 (Edited)

16555/P0171/000369 - Ross-Tech Wiki

16824/P0440/001088 - Ross-Tech Wiki

16486/P0102/000258 - Ross-Tech Wiki

1. what are your fuel trim readings? These can help you figure out if it is (maf or leaks). In your case; based on the above links/trouble codes; you have possibly both!

http://wiki.ross-tech.com/wiki/index.php/Fuel_Trim_Info

A. Test Your maf
B. check for vacuum/hose leaks

Here are pages; that shows how to test your maf and diagnose these types of codes/issues:

Part 1 -MAF Sensor Test: Jetta, New Beetle (5 wire type).

https://www.google.com/search?q=jet...:en-US:official&client=firefox-a&channel=fflb

Note: I just got done working on a 2.0l Jetta; a very common problem is the hose that goes from the manifold to the fuel regulator, they get old crack and fall off.

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billymade

· #3 · Jul 21, 2014

billymade said:
16555/P0171/000369 - Ross-Tech Wiki

16824/P0440/001088 - Ross-Tech Wiki

16486/P0102/000258 - Ross-Tech Wiki

1. what are your fuel trim readings? These can help you figure out if it is (maf or leaks). In your case; based on the above links/trouble codes; you have possibly both!

http://wiki.ross-tech.com/wiki/index.php/Fuel_Trim_Info

A. Test Your maf
B. check for vacuum/hose leaks

Here are pages; that shows how to test your maf and diagnose these types of codes/issues:

Part 1 -MAF Sensor Test: Jetta, New Beetle (5 wire type).

https://www.google.com/search?q=jet...:en-US:official&client=firefox-a&channel=fflb

Note: I just got done working on a 2.0l Jetta; a very common problem is the hose that goes from the manifold to the fuel regulator, they get old crack and fall off. You might check yours for the same thing.

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johnd49

· #4 · Jul 25, 2014

A faulty O2 sensor can trip these codes (pre-cat sensor)

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BUGSTUFF

Discussion Starter · #5 · Aug 19, 2014

Update: MAF replaced and all is well again.

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