codes p219B and p2635

[Tozan]

Here is how my day went at the dealership....

I had an appointment today at 10:00 am brought my Tahoe in at 9:30 after driving 80 miles to get there. I was told there is a minimum $220.00 diagnosis fee for testing my check engine light coming on. OK, I have no problem with this. I was an auto tech and factory trained by several manufactures and a Service Manger earlier in my life... But at 68, I have no desire to do my own repairs and wanted to hopefully depend on the experience and knowledge of a local Chevrolet dealer. After 6 hours of waiting I inquired how things were going. I was told they were not able to complete any tests due to an aftermarket intake tube, MAF and o2 sensor. These items have been working fine for over 130,000 miles with no problems and in no way are related to the problem... I asked why they didn't tell me this 6 hours ago, (no answer)... They wanted me to replace them with factory parts so they could start testing.. The parts in question have nothing to do with the problem I brought it in for. They just wanted me to spend money on things not related to the problem. They said if they replaced all those things and it doesn't fix it then next thing I would need is a new Cat. (this is called a shot gun repair just throw more parts at it and hope something will fix it) At this point I was a bit upset since it took them 6 hours to come to an inaccurate conclusion and they didn't bother telling me until I called them. Fortunately they decided to not charge me for their technicians inability to diagnose the problem... I decided to take my CHEVY to the FORD dealership next door and it took them 20 minutes to test and diagnose then give me an answer I think it's time to switch to a Ford.

The fix... As I understand it he reset the alcohol mix and a few other things. He checked all my sensors, fuel pressure, canister, valves, evap system and they are working fine. He said some of the codes might have been getting tripped as I went cross country and used a lot of variations in fuel types. This makes sense since most of the time the check eng. light came on shortly after getting gas.

I am thinking the eng light and codes coming on before are not a big deal now.

 

[swathdiver]

If your alcohol content was off, get rid of that aftermarket oxygen sensor. Your codes related to that ought to go away.

How is your fuel pressure when you are driving around and at WOT? Does it drop below 42 psi?

 

[dkad260]

If the P219B code is an imbalance, then in my opinion, I would replace BOTH upstream sensors with OE sensors. This code shows an imbalance between the two banks, so get fresh sensors on both banks then go from there. Could be a faulty injector(s) but if the sensors have over 100K on them that's where I would start

I do this every plug change around 80K miles. Plugs and upstream sensors all in one go.

 

[Tozan]

If the P219B code is an imbalance, then in my opinion, I would replace BOTH upstream sensors with OE sensors. This code shows an imbalance between the two banks, so get fresh sensors on both banks then go from there. Could be a faulty injector(s) but if the sensors have over 100K on them that's where I would start

I do this every plug change around 80K miles. Plugs and upstream sensors all in one go.

All my other o2 sensors are original.. I have 260,000 miles on them.

Fuel pressure looks pretty good so far over 42 psi.

 

[Coveman]

lol..go ford dealership! Lets face it, it’s not just the shop its also the technicians. Find a good one and stick with them.

My son had a rubbing noise from his transfer case and I drop shipped him the part and arranged to come down to install it with him in a few weeks. The noise started to increase so he took it to the chevy dealer to do the swap. They told him that they dont service trucks that old! (1999 burb)

I worked at a dealership in my youth and felt they were honest, and they worked on pretty much anything and the service manager wasn’t looking to upsell every customer —but holy cow, ever been to a german car service department? I think they run every service ticket to breathtaking heights…but they have a very nice coffee lounge!

 

[dkad260]

All my other o2 sensors are original.. I have 260,000 miles on them.

Fuel pressure looks pretty good so far over 42 psi.

Are you saying the other upstream sensor has 260K miles and now paired with a new one??? Unless I missed something.

O2 sensors have a finite lifespan, and it's not 260K miles. They get lazy and respond slowly with reduced accuracy? How's your fuel economy?

You can have a lazy, inaccurate upstream O2 sensor with no codes present.

FWIW, no chance I would run 2 sensors with remotely half the mileage discrepancy.

If you are chasing a bank imbalance with a new O2 sensor on one bank, and a 260K mile sensor on the other....then I don't know what else to recommend at this juncture.

 

[Tozan]

Are you saying the other upstream sensor has 260K miles and now paired with a new one??? Unless I missed something.

O2 sensors have a finite lifespan, and it's not 260K miles. They get lazy and respond slowly with reduced accuracy? How's your fuel economy?

You can have a lazy, inaccurate upstream O2 sensor with no codes present.

FWIW, no chance I would run 2 sensors with remotely half the mileage discrepancy.

If you are chasing a bank imbalance with a new O2 sensor on one bank, and a 260K mile sensor on the other....then I don't know what else to recommend at this juncture.

Yes three real old ones and one new...

I decided to just replace all 4 sensors with GM parts... I was also going to replace my MAF sensor but the dealership said they are no longer available... That makes me wonder how the dealership was going to replace it the other day with an original GM MAF so they could keep testing it. What idiots they are...

 

[dkad260]

the dealership said they are no longer available

What year is your Tahoe? I don't know if all the 07-14 5.3's are the same.

 

[Tozan]

What year is your Tahoe? I don't know if all the 07-14 5.3's are the same.

2011

 

[dkad260]

I would use some MAF cleaner on it anyway. Also make sure there's no air leaks between the MAF and the throttle body.

Once you get the upstream sensors installed, remove the NEG battery cable from the battery for 15 min or so, some say 30 but I do this when I start the job and it's def at least 15-30 min. This will let the PCM relearn the trims and hopefully should help your issue.

Other than that it could also be an injector(s) as I had mine rebuilt around 140K and some of the filter baskets were coming apart.