1. We got a check engine light on the Red 328IC with Auto tranny and had the code/reset tool in the toolbox. Code indicated "19" Pre-cat o2 sensor heater cylinders 1-3, not voltage or activity which are also given by other numbers. My question is does this particuler code indicate something other than replacement. I am aware that these codes are "leads" and I may find a broken wire or something simple(BCS best case scenario) or actual fouled out and in need of replacement(WCS). As my wife has indicated "running rough" I suspect its time for a tune-up(85K on Odo). Prices I have seen are around 150.00-200.00 for one or are they usually sold in pairs? Best price was Bavarian but for our year they don't show a pre-cat(Hmm?) Any help appreciated.
2. Also got the airbag light on . Turned it off with the reset tool but it came back indicating a seat belt latch(female) drivers side. Does this require replacement of entire unit?
Best price was Bavarian but for our year they don't show a pre-cat(Hmm?)<<< and what year is that?
o2 sensors... prices vary. but OEM would be around that price. If you are knowledgeable in the art of splicing a BOSCH universal sensor though, that price will be b/n $25-35.- per eBay offers to sell ;-)
RE: seatbelt latch... it sez "female". that means the thingie with the release button thts attached to ur seat. That's what your suggests as non-functional
Last edited by darkhorse737; 07-04-2008 at 01:35 AM.
Rod, I can expand on the diagnostic code for you - 19 means that the final stage inside the DME has set an internal flag due to a short to ground, short to battery voltage or disconnection between the output transistor of the DME and the pre cat O2 sensor on the exhaust relating to the front 3 cylinders. Get out the BMW electrical troubleshooting manual (downloadable from here Free Phone System Manuals Voice Communications 800 593-6000 ) for your car and check continuity of the wiring before you spend your money.
David Mc; you could be onto a heck of a save here. I looked at the manual and from the schematic and using my background in electrical troubleshooting AC/Heat units these O2 sensors are four wire gizmos. 2&4 contain the variable resistor circuit which likely reads exhaust temp to comunicate via two connections to DME and 1(Brn htr grd)&3(Red/Wht to fuse box) contain what appears to be a heating element circuit. This circuit seems to follow an electrical path to the DME(1) and (3) power (This particular code indicated "heater" so this may be the corcuit that is causing the code . This goes along with your insight about a short or open circuit.
OK try and follow along with me here...
From the schematic all of these are contained in a box together which if I test continuity of the wiring at the connector and find any loss this will probably mean a new sensor as it would stand to reason that these wires are not separated and are probably self-contained in a harness ala the apparatus itself.. If someone knows different please tell me. The other loss it appears I need to check for would be of t he wiring outside of the connector between the DME and the connectors. From all the pictures diagrams I have seen in The Bentley manual(thgis one seems like one circuit from each O2 sensor pre and post CATCONV and online these four sensors all seem to feed the DME and power. Any further insight would be apprciated as this trouble shooting seems time intensive? Wish me godspeed on this trek.
Yep, I am with you. Much as people swear by the Bentley manual, the information is a bit dated so I only use it as a supplement for TIS and the BMW Electrical Troubleshooting Manual, which are both model specific and up to date. Good Luck.
:-) i was waiting for you tell me your year model.... reason being that some models have a O2 sensor relay, and some don't. Anywayz, since your issue is a "no voltage" issue... i was going to suggest you look there first
sorry darkhorse 737...this is a 1999 model and maybe I did not explain it clearly . It was not that the code meant "no voltage" I was trying to say that this particular code' explaination included the words "heater" and not "voltage" as other codes do. In looking at the schematic for an O2 sensor it does include a "heater circuit". It certainly would be good information to know if our model had a relay or not.
DH 737 What is the "its" you are referring to. I am using a Peake R5/FCX-3. Your comment about my code being invalid is throwing me for a loop, thus my question?
After what you and McD have mention and from looking at schematic drawing in the BMW troubleshooting guide and and Bentley manual...it stands to reason that the sensor itself is possibly bad(ala your tip)It makes the code 19 seem pretty straightforward. I want to check and make sure I don't find any dangling wires or broken wires or burned wires. So fasr they looked intact. I also have to decide if it is just a bad sensor at one location if I want to change out the rest for a full "tuneup". If the other are showing good continuity they should be OK?
So on our 328Ic with a check engine light and resultant code 19 on table 11which indicates an oxygen sensor fault heater circuit cylinders 1-3. This model has a relay where the Bentley maualshows it and its functional. After removing the fuel rail cover and disconnecting the O2 sensor connectors ala the Haynes manual I discovered four wires Red/White/Black/Yellow. Continuity troubleshooting here indicated an open circuit between the red and white on the rearward sensor vs. a continuous circuit on the forward. I believe I have a failed O2 sensor. The confusing part is it would stand to reason the the forward one would be for cylinders 1-3 and the rearward for 4-6. Unless the wiring switches course as it is routed around the engine I am going to have to wait until I can expose the exhaust manifold cover where these sensors are located(someone correct me if I am wrong) to check again. I could just replace them both since this seeminly labor intensive job could take some time. I don't wan to have to do it twice )Any advise apprciated or if I am on the right track hit me back?
Rod, Your vehicle has 4 x O2 sensors (1 x Pre Cat Bank 1-3, 1 x Post Cat Bank 1-3, 1 x Pre Cat Bank 4-6 and 1 x Post Cat Bank 4 -6). According to the BMW Electrical Trouble shooting Manual for your car ( http://www.wedophones.com/Manuals/BM...g%20Manual.pdf ) Based on my reading, the wires connecting each sensor to the DME have the same colour code:- Red with White Stripe (Battery + from Terminal 87 of the Engine control module relay), Brown (which is the heater Ground wire), Yellow (Which is the sensor signal) and Black (which is the sensor ground). The pre cat sensor for Bank 1 -3 is designated component B62101 and the Brown, Yellow and Black wires from the sensor connect to terminals 25, 75 and 67 of your DME. The same colour wires from the post cat O2 sensor for cylinder Bank 1-3 (Component B62102) connect to terminals 79, 77 and 71 of your DME. Pre (Component B62201) and post cat (Component B62202) connections for the O2 sensors which relate to Cylinder Bank 4-6 are to terminals 55,76,70 and 61,78,72 respectively. As Dark Horse says, the heater is built into the sensor, so if continuity of the wiring harness checks out, replacement of a bad sensor is the only option. Hex code 19 (Dec code 25) is applicable to the M52 engined vehicles, so you ARE reading the correct table from your Peake Tool handbook.
I'm sorry i threw you in a loop. and glad that David is here to help as well :-)
for starters, i've never used a peake tool and don't know that it uses hex codes
My bad, and i apologize as for my part i understood Code 19 to be a BMW code which i see was not the case here.
Anywayz, it does appear that you do have a faulty 02 sensor. If you are anywhere near or over 100,000miles BMW does suggest you replace the 02 sensors as part of their 100,000 mile maintenance proggie. :-)
Thanks for all the aide..this is a great site. Looks like we have an afternoon of replacing sensors. It seems labor intensive getting to the exhaust manifolds for the pre-cats but what else is new. The alternative is too let a shop do it and I don't even want to imagine the cost. With 85k on the Odo I'll take a look at the plugs, fuel filter and see if I can get some better performance. Car runs great but maybe I don't know yet . Good learning experience however and the info is out their isn't it...I'll update
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