When error codes are not clear it is often the spare part that is blamed

It is not always certain that error codes give a true and fair view of which parts should be replaced to solve a problem. And all too often, this leads to questioning of the quality of the replaced part, which, logically, does not solve the real problem.
 
Two examples of this are error codes on OPEL models with 1.8 petrol engines from 1997-2004 and the first OPEL and SAAB models with 1.9 CDTI / TiD engines. Both examples are supported by the experience that Elektro Partner, providing hotline and technical solutions for car repair shops in Denmark, Norway and Sweden (Autodata, TEXA, Delphi and Nextech) has made. Here, CEO and owner Frank Donslund says: "For the petrol engine, the problem is in fact a high sensitivity to deviations in air mass measurement. An error of just 0.1 volts at full load may suffice to trigger a luminous engine lamp in the dashboard". 
 
The error codes will typically be one or more of the following:
 
P0130 - Oxygen sensor circuit failure function
P0170 - Fuel trim malfunction
P0171 - Fuel trim lean
P0300 - Random fault ignition detected
 
At the 1.8 gasoline engine, the lambda sensor (Triscan 8812 24003) will most often be replaced, but soon the engine lamp will light up again. Often, the lambda sensor is returned as a complaint, even if it is either the air mass meter (Triscan 8812 24003) or a missing software update of the engine control, which is the scapegoat.
 
                                     

Triscan oxygen sensor 8845 24008
 
 
Triscan air mass meter 8812 24003
 
 
The air mass meter used by GM in the 1.8 gasoline engines is used in 37 different car models with 1.8 and 2.2 liter engines, respectively, in the years 1994-2015, but also SAAB 9-3.
 
MakeModel
OPELASTRA G
OPELASTRA H
OPELCORSA C
OPELMERIVA A
OPELOMEGA B
OPELSIGNUM
OPELTIGRA TwinTop
OPELVECTRA B
OPELVECTRA C
OPELZAFIRA A
SAAB9-3

 

At the 1.9 CDTI / TiD engines used by OPEL and SAAB in the period 2004-2012, there is also reason to be extra aware when one of the following error codes are displayed after an illuminating engine lamp:
 
P2280 - Airflow limited, leakage between air filter and airflow meter
P1909 - Particle filter
 
If the error code is P2280, some of the first to check are:
 
1) Air filter for clogging
2) Turbo hose and intercooler for leaks
3) Flap in the intake manifold
 
If there is no fault here, an inaccurate air mass signal due to a defective air mass meter (Triscan 8812 10010) may be the culprit. It is worth noting that a disturbed air flow in the intake or inaccurate air mass measurement will often cause clogging of the particle filter and a P1909 error code. When replacing it is important to make sure that the airflow meter is in OE quality. Unfortunately, there are a lot of airflow meters that are not in OE quality, which often causes the error to occur again after relative short-term operation.  
 
 
Triscan air mass meter 8812 10010
 
Car models in the period 2004-2012 that are covered by the problem
 
MakeModel
OPELASTRA H
OPELASTRA H
OPELSIGNUM
OPELVECTRA C
SAAB9-3
SAAB9-5

 

1.9 The CDTI engine is also found in several Alfa Romeo (JTD) and Fiat (Multijet) models, but the problem is not seen here. The reason is probably that the engine management software used is not the same, but the car manufacturer's own. The way in which the software's individual parameters play together are tightly tuned to each car model. So even though the engine and components are the same, the same problems may not occur at the intersection of car brands and models.