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HELP!! ODB2 Code P1153

06-01-2005, 07:31 AM
I'm new to automotive forums so all advice and comments will be greatly appreciated.

My service engine soon light is on and I took it to AutoZone to get the Diagnostics scan done and it came back with this trouble code.

P1153, Insufficient Switching Bank 2 Sensor1

Has anyone else had this problem? And if so, is it a big deal and what could I do to fix it?

Also, this may or may not be involved with the P1153 trouble code but when I go to start the engine after it has been sitting for a while, it turns over like it wants to start but doesn't. I let off of the key and wait about a second and try it again and it starts right up. If it has been sitting for 15 minutes or so it will crank up the first time. I was thinking maybe the fuel pump or the fuel pressure regulator.

Thanks for the help!

06-01-2005, 07:42 AM
I forgot to mention that this is for a 1999 Chevrolet Silverado Z71 Ext Cab, 89K miles, 5.3L V8

06-02-2005, 12:00 AM
O2 two is passenger side, sensor 1 is pre cat.....replace and code should clear

06-02-2005, 12:01 AM
as for the hard starting, sounds like a fuel pressure regulator goin bad, id replace

06-02-2005, 07:16 AM
as for the hard starting, sounds like a fuel pressure regulator goin bad, id replace

Thanks for the help. Have you ever replaced an O2 Sensor or pressure regulator? Is it difficult?

06-02-2005, 10:00 AM
i luckily have not had to do a regulator, but it should be pretty easy...go get your self a chiltons, or haynes repair manual itll help you out a good bit...the o2 sensor is as easy as unscrewing it from the exhaust, unplugging it and plugging new one in and screwing the new one in.....just dont forget to put some antiseize on the new threads.....

06-02-2005, 04:45 PM
I appreciate the help. I'll let you know how the pressure regulator goes.

06-02-2005, 09:47 PM

06-03-2005, 06:17 AM

I replaced the O2 sensor with a Bosch Universal. The universal was $30 cheaper than the OE and basically the only difference is you have to take the connector off the bad sensor and tie it in with the universal sensor. Pretty simple procedure. The "service engine soon" light hasn't came back on so i'm happy. I'll go for the pressure regulator next.

06-03-2005, 07:08 AM
Fuel pressure regulator is a piece of cake. Located midway above the left (driver's) side valve cover, it's a little larger around than a quarter and has one single vacuum hose attached to it. If you pull the vacuum hose and get raw fuel, the regulator is bad.

It's held on only by a clip, and has just the hose attached to it. Literally a two minute job.


06-03-2005, 09:57 AM
good to know its working for ya wth4ua.

slacker--thanks for clearing that up...

06-03-2005, 12:55 PM
Screw the new sensor, get a simulator. They are like 34 bucks each.

06-03-2005, 09:27 PM
Screw the new sensor, get a simulator. They are like 34 bucks each.

and illegal

06-20-2005, 06:36 AM
well, the fuel injector pressure regulator is good. Man, i am not looking forward to replacing the fuel pump. But my gas gauge honks up all the time (registers empty when i am completely full) so I guess I will correct that problem (sending unit) when i replace the fuel pump. So everyone tell me, is it easier to take the bed off to get to the gas tank or drop the tank and leave the bed on?

06-20-2005, 12:50 PM
How much fuel is in the tank and how much does your friend/helper like laying on his back doing the "Hold up the tank?"

06-21-2005, 07:56 PM
pull the bed, it is alot easier, and yes ive done it both ways

07-24-2005, 12:46 PM
pull the bed, it is alot easier, and yes ive done it both ways

Well, I finally got around to the fuel pump. The whole job took about 2 1/2 hours. We pulled the bed (I recommend at least 3 people, males, to help take the bed off) and easily swapped the fuel pump. Like someone mentioned earlier, 8 bolts, disconnect a couple of connectors off the wire harness at the back bumper, and disconnect the gas line where you fill the tank up at. Pretty simple procedure, but that dang bed is still heavy with 3 people. Anyways, the fuel pump is working great, the truck cranks up right away and no wishy washy fuel gauge. Check ebay first before going to a dealership or auto parts store. I got a brand new electric fuel pump for my 99 Z71 for around $130 w/shipping compared to $850 the dealership wanted to charge me for installing one. I hope my problems have or will help someone down the line.

07-24-2005, 04:23 PM
Wish I'd read this topic sooner! I'm working as a mechanic's assistant in the service dept. at a Chevy dealer for the summer. When a fuel pump needs to be replaced, the mechanics do some sort of trick to short the old pump (assuming it will pump at all!) and use it to pump out all the gas! As you can imagine, makes it a bit easier to simply drop the tank ;).

07-25-2005, 09:10 AM
Oh well, it wasn't too bad. I would like to know that trick if you could "leak" that information.

07-25-2005, 11:21 AM
all you have to do is put a jumper on the fuel pump relay....itll run til you remove that jumper..

07-25-2005, 04:38 PM
so if you could get the fuel completely out of the tank itd be an east job?

cause mine still runs and i have plenty of other cars to drive so i could jsut stop putting gas in it till it runs out


i have a drop in bed liner id have to take off and a toneau cover id have to remove

if holding the tank up is the only issue with dropping the tank i have a floor jack thatll do that

07-25-2005, 05:25 PM
Yep, jump the relay, then unbolt the ties holding the tank up, and it'll fall right off! Won't be too heavy at all, might want to support it with a jack while removing the supports anyway for your finger's sake though! Once removed, the fuel pump comes right out.

07-26-2005, 08:16 AM
Be careful letting it fall right off, there are 3 hoses and two wire harness connectors on top of the fuel pump that will need to be disconnected before the tank can actually "fall off". You definitely don't want any damage to these. Look in my gallery at the link below for a couple of pics of the repair.

07-21-2009, 03:27 PM
Lifting the bed it is soooo much easier to do a fuel pump modual.
Just loosen the 3 bolts on the passenger side of the bed leave about 5 threads installed, pop the 2 connectors by the bumper, take the 3 bolts out on the drivers side of the bed. Lift the drivers side of the bed about 2 feet, and you are there. Easy deal. Turns a 2 hour job into about 45 minutes. I put a block between the bed and frame while doing the modual as a safety precaution.

Doesn't work on Blazers and Suburbans / Yukons

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