P1278 & P1279 SES codes - Nissan Titan Forum
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post #1 of 2 (permalink) Old 08-04-2014, 09:44 AM Thread Starter
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Question P1278 & P1279 SES codes

I recently had these codes pop up in my 04 with 36,000 on it.

I replaced the up-stream O2 sensor on Bank 1 and cleared the codes. Yesterday the SES light came on again and the code was P1279 only. So, replacing the O2 sensor fixed the P1278 code. Wonder what will fix the P1279 code?

On a side note.. This truck lived its whole life in CO until I purchased it and drove it to NorCal where it will now live. Do you think the 10% ethanol CA adds to the fuel is causing the truck to act up? My next step is to clean the MAF sensor and rerplace the PVC valves. Any thoughts??

Possible causes

- Air fuel ratio (A/F) Harness or connectors is open or shorted
- Air fuel ratio (A/F) sensor 1 Bank 1
- Air fuel ratio (A/F) sensor 1 heater Bank 1
- Fuel pressure
- Fuel injector
- Intake air leaks
- Exhaust Gas leaks
- PVC

- Air Flow Meter

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post #2 of 2 (permalink) Old 03-20-2017, 03:08 PM
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Did you ever get it figured out?
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